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1.
塔里木盆地塔中32井的中、上奥陶统钻遇厚度为1 462 m。它是一套巨厚的深灰色泥岩、页岩与灰色砂岩、粉砂岩互层夹少量灰岩的地层。其中深灰色泥岩、页岩最多；砂岩和粉砂岩主要分布于上部和下部，中部砂岩和粉砂岩较少；鲕粒灰岩数量少，主要夹于深灰色泥页岩中。这些砂岩和鲕粒灰岩既可单独成层，但更常见它们与深灰色泥页岩组合成薄互层。薄互层中发育脉状、波状和透镜状层理，并普遍发育交错层理和双向交错纹理。这些特征表明砂岩和鲕粒灰岩为深水斜坡上的内潮汐沉积的产物。这些内潮汐沉积进一步划分为4种类型：双向交错纹理细砂岩型、单向交错层和双向交错纹理中-细砂岩型、韵律性砂泥岩薄互层型和鲕粒灰岩型。它们具有5种垂向沉积层序，在剖面上常形成多旋回韵律性沉积组合。 相似文献
2.
断裂带是一个宽度、长度和高度均与断距呈正比关系的三维地质体,具有典型的二分结构：即断层核和破碎带。断层核由多种类型的断层岩和后期胶结物组成,具有分选差,粘土含量高,颗粒粒径小等特征,表现为具有比围岩更低的孔渗性。破碎带同围岩相比发育大量的裂缝,裂缝的密度随着离断层核距离的增大而逐渐减小,孔渗性较高。断层岩类型取决于断移地层的岩性、成岩程度和断裂变形时期。对于同生断层而言,泥岩和不纯净的砂岩主要发生泥岩涂抹作用;纯净砂岩发生解聚作用,形成颗粒重排的变形带。中成岩阶段发生断裂变形,泥岩发生泥岩涂抹作用,不纯净的砂岩发生碎裂作用和层状硅酸盐涂抹作用,形成碎裂岩和层状硅酸盐 框架断层岩;纯净砂岩主要发生碎裂作用,形成碎裂岩。晚成岩阶段发生断裂变形,碎裂作用成为主要的变形机制,泥岩破碎形成大量断层泥,不纯净的砂岩和纯净的砂岩均形成碎裂岩,其中纯净砂岩形成的碎裂岩由于石英的压溶胶结变得更致密。因此不同成岩阶段、不同岩性形成的断层岩类型不同,泥岩涂抹的排替压力高于层状硅酸盐 框架断层岩和碎裂岩,即使都是碎裂岩,其渗透率相差7个数量级。从断裂带结构看油气运移和保存,断层垂向封闭主要靠剪切型泥岩涂抹的连续性,侧向封闭能力取决于断层岩物性,物性很高的碎裂岩自身封闭能力很差,依靠两盘岩性对接封闭油气,最小断距决定油水界面位置。物性很低的断层岩一般能封住一定高度的油气柱,其是断裂带中泥质含量的函数。断层在储盖层段变形机制差异,决定了断裂输导与封闭油气的耦合,即破碎带双向输导充注,盖层段剪切型泥岩涂抹顶部封闭,断层核遮挡成藏。 相似文献
3.
加里里盆地为澳大利亚东部主要的含煤盆地,也是其煤层气勘探开发的主要区块。通过煤质特征、气源条件、构造演化、盖层条件和水文条件等对煤层气富集的主控因素和富集区进行研究。结果表明,该区煤质及生气能力相当,白垩纪中期煤层开始持续生气;白垩纪晚期的区域构造抬升使气藏遭到破坏;扇三角洲主扇体间的局部泥岩相对发育,可形成良好盖层;靠近盆地中心存在地层水滞留区,地层水矿化度高,氯化钙型为主,对煤层气保存有利,含气量和氮气组分也显示含气性变好。因此,良好局部盖层的发育和滞水环境是该区煤层气富集的主控因素;Hulton-Road构造东北、Marathon单斜以东区域及中部Berly突起以北部分区域煤层的富气条件好,是煤层气的富集区。 相似文献
4.
河南省濮阳地区古近系沙河街组沙三段盐岩特征及其与岩性油气藏的关系 总被引：4，自引：2，他引：4
东濮凹陷北部中央隆起带及其周边地区在古近系沙河街组沙三段由下向上依次发育三套盐岩，每一套盐岩又由若干个盐岩韵律组成，盐岩韵律由盐岩（或膏岩）和泥岩构成。不同的盐岩韵律、同一盐岩韵律在不同地区厚度差异很大。盐岩的构造类型主要有原生板状盐岩构造、次生盐岩墙构造和后生变形盐岩构造。由于盐岩层极其致密，其阻隔作用使其下部地层的地层温度和地层压力均较高，有利于下覆生油岩中的有机质向油气转化；同时，在高温、高压下盐岩呈塑性状态，因此，又是良好的盖层。盐岩与砂泥岩相变，加之与构造配合形成一定规模的与盐岩有关的岩性油气藏，扩大了油气勘探的领域。与盐岩分布有关的油气藏有四种类型：砂体尖灭油气藏、岩性-断层油气藏、断层-岩性油气藏、断背斜油气藏。本文以河南省濮阳地区古近系沙河街组沙三段为例，详细阐述了三套盐岩在研究区的分布特征及其与油气运聚的关系，对于寻找隐蔽油气藏及下步滚动勘探开发具有十分重要的意义。 相似文献
5.
页岩能源共生矿产成矿（藏）地质条件研究--以松辽盆地上白垩统青山口组为例 总被引：1，自引：0，他引：1
页岩能源矿产已成为国内外研究热点,并掀起一场“页岩革命”,其主要包括油页岩、页岩油、页岩气等非常规页岩能源资源。这套页岩能源矿产与富有机质泥岩密切相关,其在成因上存在一定的联系和共生规律,但成矿（藏）条件又存在明显的不同。松辽盆地上白垩统青山口组发育厚层的暗色泥岩,由于其面积巨大,泥岩中有机质丰度高,埋藏深度差异明显,具备形成页岩能源共生矿产成矿（藏）的地质条件。初步分析认为,松辽盆地青山口组下部暗色泥岩有机质丰度较高,有机质类型主要为I~II1型,为油页岩成矿,页岩油、页岩气成藏提供足够的有机质来源,其中在松辽盆地东南隆起区,青山口组埋藏较浅（深度＜1 000 m）,有机质热演化程度较低（Ro＜0.7%）,为良好的油页岩成矿场所。埋藏浅的富有机质泥岩可能因微生物活动而形成生物成因页岩气,较弱的成岩压实作用和极为丰富的有机质为页岩气成藏提供足够的空间（孔隙度4%~14%）。从盆地东部的隆起带到中央凹陷区,随着埋深加大（深度＞1 000 m）,热演化程度逐渐增强（Ro:0.7%~1.2%）,基本处于成熟-过熟阶段,有机质大量排烃,为页岩油、页岩气成藏提供足够的来源。异常高压和排烃造孔形成良好的储层,使泥页岩具备页岩油、气成藏的良好条件。因此,松辽盆地可能存在呈环形的页岩能源矿产成矿（藏）规律,其中在东南隆起区和中央凹陷隆起地区为油页岩成矿和生物型页岩气有利成藏带;中央凹陷大部分地区可能为页岩油、热解型页岩气有利成藏带;中央凹陷埋藏最深部位可能发育热裂解型页岩气有利成藏带。 相似文献
6.
临兴区块上古生界储集层为致密砂岩，裂缝发育特征及对致密气富集影响尚不清楚，一定程度上制约了甜点区预测。
根据岩心、露头、薄片及测井资料，分析了研究区裂缝发育特征，探讨了裂缝对致密砂岩气富集的影响。临兴区块上古生界主
要发育高角度缝，其次为中低角度缝及水平缝，微观上根据裂缝与矿物颗粒的相对位置关系，可识别出粒内缝、粒缘缝和穿粒
缝，其中粒缘缝最为发育。受塑性泥岩阻挡，裂缝垂向延伸较差，一般延伸1~2 m后消失于泥岩层中，受燕山期北西—南东向
地应力影响，裂缝走向多为北东—南西向，裂缝密度一般2~5条/ｍ。裂缝可改善储集空间、提高油气充注效率，储层裂缝发育
区渗透率可增大1~2个数量级，含气饱和度高，此外，研究区裂缝是油气垂向运移的有效通道，影响着石盒子组及石千峰组致
密气的富集，在后期的勘探开发过程中应充分寻找裂缝发育区，并通过进一步压裂获得高产。 相似文献
7.
临兴区块上古生界储集层为致密砂岩,裂缝发育特征及对致密气富集影响尚不清楚,一定程度上制约了甜点区预测。
根据岩心、露头、薄片及测井资料,分析了研究区裂缝发育特征,探讨了裂缝对致密砂岩气富集的影响。临兴区块上古生界主
要发育高角度缝,其次为中低角度缝及水平缝,微观上根据裂缝与矿物颗粒的相对位置关系,可识别出粒内缝、粒缘缝和穿粒
缝,其中粒缘缝最为发育。受塑性泥岩阻挡,裂缝垂向延伸较差,一般延伸1~2 m后消失于泥岩层中,受燕山期北西-南东向
地应力影响,裂缝走向多为北东-南西向,裂缝密度一般2~5条/ｍ。裂缝可改善储集空间、提高油气充注效率,储层裂缝发育
区渗透率可增大1~2个数量级,含气饱和度高,此外,研究区裂缝是油气垂向运移的有效通道,影响着石盒子组及石千峰组致
密气的富集,在后期的勘探开发过程中应充分寻找裂缝发育区,并通过进一步压裂获得高产。 相似文献
8.
The exploration targets in the Kuqa Depression at present are mainly structure traps in Cretaceous-Tertiary. Due to the complexity of mountain distribution and reservoir forming conditions, the exploration of Jurassic in the eastern Kuqa Depression has been in a state of semi-stagnation since the discovery of the Yinan-2 gas reservoir. According to the concept and theory of “continuous petroleum reservoirs” and the re-analysis of the forming conditions of the Yinan-2 gas reservoir and regional natural gas in the eastern Kuqa Depression, it is believed that the deep Jurassic has good natural gas accumulation conditions as well as geological conditions for forming continuous tight gas reservoirs. The boundary of the Yinan-2 gas reservoir is not controlled by a structural spillpoint. The downdip part of the structure is dominated by gas, while the hanging wall of the fault is filled by water and forming obvious inverted gas and water. The gas reservoir has the normal temperature and ultra-high pressure which formed in the near source or inner-source. All of these characteristics indicate that the Yinan-2 gas reservoir is different from conventional gas reservoirs. The deep Jurassic in the eastern Kuqa Depression has multisets of source-reservoir-cap assemblages, which comprise interbedded sandstones and mudstones. These assemblages are characterized by a self-generation, self-preserving and self-coverage model. Reservoir sandstones and coal measure mudstones are interbedded with each other at a large scale. As the source rocks, Triassic-Jurassic coal measure mudstones distribute continuously at a large scale and can generate and expel hydrocarbon. Source rocks contact intimately with the overlying sandstone reservoirs. During the late stage of hydrocarbon expulsion, natural gas charged continuously and directly into the neighboring reservoirs. Petroleum migrated mainly in a vertical direction over short distances. With ultra-high pressure and strong charging intensity, natural gas accumulated continuously. Reservoirs are dominated by sandstones of braided delta facies. The sand bodies distribute continuously horizontal. With low porosity and low permeability, the reservoirs are featured by strong heterogeneity. It is hypothesized that the sandstones of the interior depression tend to be relatively tight with increasing depth and structure stress weakness. Thus, it is predicted that continuous tight gas reservoirs of ultra-high pressure may exist in the deep formations of the eastern and even the whole Kuqa Depression. So, it is worth evaluating the exploration potential. 相似文献
9.
致密砂岩的形成机制及其地质意义——以塔里木盆地英南2井为例 总被引：7，自引：0，他引：7
砂质岩的孔隙和喉道被网格状粘土矿物和次生加大矿物充填成微细孔喉状结构时,形成具有较高毛细管压力的致密砂岩。它与地层水发生水锁效应,可大大降低渗透率,成为致密砂岩盖层。当含水饱和度在50%以下时,束缚水饱和度比较低,致密砂岩储层可以产气;当含水饱和度在50%～90%区间时,具有较高的束缚水饱和度,相对渗透率非常低,它既不能产气也不能产水,反映为渗透率瓶颈区(具有盖层性质);当含水饱和度大于90%以上时,致密砂岩储层仅微量产水。塔里木盆地英南2井侏罗系气藏盖层由致密砂岩构成,不含水时的气体渗透率在(0.027～0.081)×10-3μm2,不能构成封堵;当含水饱和度达到60%以上时,相对渗透率几乎为零,构成有效盖层。 相似文献
10.
通过实测莺歌海盆地莺歌海组二段泥岩盖层的排替压力,建立了盖层排替压力与声波时差的线性关系,进而提出了利用声波时差及地震速度资料求取排替压力的方法。接着,利用测井声波时差和地震速度资料,按等效深度法确定莺歌海组二段下部泥岩盖层的超压分布。综合考虑盖层累计厚度、排替压力、剩余压力、气藏内部压力、断裂对盖层破坏程度和天然气本身性质（比如流动黏度）,提出了盖层封闭能力综合评价指数,并据此对莺歌海组二段泥岩盖层综合封闭能力进行评价。结果表明：莺歌海组二段泥岩盖层封闭能力强的地区分布在乐东区大部、临高区南部及东方区东部到一号断裂之间的地区,一号断裂南段、东方区东部和北部地区则为盖层封闭能力较强的地区,研究区边部由于地层上倾出露地表,盖层封闭能力逐渐减弱。莺歌海组二段泥岩盖层封闭能力中等及以上地区可作为天然气的有效盖层;由现有气藏分布可知,莺歌海组二段泥岩盖层封盖能力良好,中深层的天然气保存条件优越。 相似文献
11.
Dawei Lv Jitao Chen Zengxue Li Guiqiang Zheng Cuiyu Song Haiyan Liu Yanru Meng Dongdong Wang 《Resource Geology》2014,64(4):332-345
The Huanghebei Coalfield, one of the coal production bases in North China, was considered as a coalfield without coal‐bed methane (CBM) during past decades. In recent years, however, CBM has been discovered in coal‐bearing successions. In order to understand the CBM geological characteristics and accumulation process in this area, fifteen coal samples were collected and analyzed with respect to coal maceral and reflectance. The result shows that the gas distribution is uneven and the content varies in different areas even for the same coal bed. The storage of CBM is affected by geological factors such as burial depth, geological structures, and magmatic intrusion, among which the former two are more important in the formation of CBM. Deep burial of coal beds with the presence of cap‐rock mudstone can seal CBM. The CBM is also accumulated and preserved at the place where normal faults are distributed. Magmatic intrusion causes contact metamorphism and controls the CBM formation by heating the coal‐bearing successions. The obtained data indicate the geological conditions in northeastern Zhaoguan Mine are preferable for CBM formation and conservation; recent exploration estimates the CBM geological reserves up to 282.16 Mm3 and average of reserve abundance at 0.1662 × 108 m3 km?2. The Changqing Mine is a potential prospect in terms of CBM exploration since its geological conditions (structures and burial depth) are similar to the Zhaoguan Mine and its cap rock is even better. 相似文献
12.
Moutaz A. Al-Dabbas Jassim A. Al-Jassim Amanj I. Qaradaghi 《Arabian Journal of Geosciences》2013,6(12):4771-4783
The depositional facies and environments were unraveling by studying 21 subsurface sections from ten oilfields in the central and southern Iraq and a large number of thin sections of the Nahr Umr (siliciclastic deposit) Formation (Albian). This formation is mainly composed of sandstone interlaminated with minor siltstone and shale, with occurrence of thin limestone beds. Nahr Umr Formation is subdivided into three lithostratigraphic units of variable thicknesses on the basis of lithological variations and log characters. Mineralogically and texturally, mature quartz arenite and sandstones are the common type of the Nahr Umr Formation. The sandstones are cemented by silica and calcite material and have had a complex digenetic history. Compaction, dissolution, and replacements are the main diagenetic processes. Prodelta, distal bar, distributary mouth bar, distributary channel, over bank, and tidal channel are the main depositional environments recognized for the Nahr Umr Formation, within the studied wells. This formation was deposited in shallow marine and fluvial–deltaic environments and exhibit progradational succession of facies. Eight sedimentary facies that have been identified in the Nahr Umr Formation include claystone lithofacies, claystone siltstone lithofacies, lenticular-bedded sandstone–mudstone lithofacies, wavy-bedded sandstone–mudstone lithofacies, flaser-bedded sandstone–mudstone lithofacies, parallel and cross lamination sandstone lithofacies, trough cross-bedded sandstone lithofacies, and planar cross-bedded sandstone lithofacies. The depositional model of the Nahr Umr Formation environment was built based on the lithofacies association concepts. 相似文献
13.
Kim Senger Thomas Birchall Peter Betlem Kei Ogata Sverre Ohm Snorre Olaussen Renate S.Paulsen 《地学前缘(英文版)》2021,12(6):411-427
Marine controlled source electromagnetic(CSEM)data have been utilized in the past decade during petroleum exploration of the Barents Shelf,particularly for de-risking the highly porous sandstone reservoirs of the Upper Triassic to Middle Jurassic Realgrunnen Subgroup.In this contribution we compare the resistivity response from CSEM data to resistivity from wireline logs in both water-and hydrocarbon-bearing wells.We show that there is a very good match between these types of data,particularly when reservoirs are shallow.CSEM data,however,only provide information on the subsurface resistivity.Careful,geology-driven interpretation of CSEM data is required to maximize the impact on exploration success.This is particularly important when quantifying the relative re-sistivity contribution of high-saturation hydrocarbon-bearing sandstone and that of the overlying cap rock.In the presented case the cap rock comprises predominantly organic rich Upper Jurassic-Early Cretaceous shales of the Hekkingen Formation(i.e.a regional source rock).The resistivity response of the reservoir and its cap rock become merged in CSEM data due to the transverse resistance equivalence principle.As a result of this,it is imperative to understand both the relative contributions from reservoir and cap rock,and the geological sig-nificance of any lateral resistivity variation in each of the units.In this contribution,we quantify the resistivity of organic rich mudstone,i.e.source rock,and reservoir sandstones,using 131 exploration boreholes from the Barents Shelf.The highest resistivity(＞10,000 Ωm)is evident in the hydrocarbon-bearing Realgrunnen Subgroup which is reported from 48 boreholes,43 of which are used for this study.Pay zone resistivity is primarily controlled by reservoir quality(i.e.porosity and shale fraction)and fluid phase(i.e.gas,oil and water saturation).In the investigated wells,the shale dominated Hekkingen Formation exhibits enhanced resistivity compared to the background(i.e.the underlying and overlying stratigraphy),though rarely exceeds 20Ωm.Marine mudstones typically show good correlation between measured organic richness and resistivity/sonic velocity log signatures.We conclude that the resistivity contribution to the CSEM response from hydrocarbon-bearing sandstones out-weighs that of the organic rich cap rocks. 相似文献
14.
阿姆河盆地卡拉库里区块侏罗系油气地质条件分析 总被引：1，自引：0，他引：1
卡拉库里区块位于阿姆河盆地北部的查尔朱阶地上,勘探目的层为上侏罗统卡洛夫阶—牛津阶碳酸盐岩。烃源岩以下—中侏罗统滨海-三角洲相沉积的深灰色泥岩、碳质泥岩和煤层为主,有机质丰度中等—好,腐泥-腐殖型和腐殖型,进入成熟阶段,具备一定的生烃潜力,区块所在的查尔朱阶地正好位于烃类运移的指向上,有利于烃类的聚集。上侏罗统卡洛夫阶—牛津阶台地相沉积的鲕粒灰岩、砂屑灰岩是区块内的主要储层,储集空间为粒间溶孔、铸模孔和压溶缝,储层以低孔低渗为主,但在裂缝的配置下,储集性能较好。上侏罗统碳酸盐岩的层间水的矿化度高,成因系数值rNa/rCl和rCa/rMg分别为0.7和3.5,地下水处于停滞的还原环境,上侏罗统启莫里阶—齐顿阶膏盐层厚度大且广泛分布,封闭性好,有利于油气保存。根据区块构造解释成果,研究区主要发育低幅背斜圈闭,圈闭的形成时间与油气运移时间配置关系合理,预测油气富集区主要位于区块南部的背斜构造带上。 相似文献
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本文依据准噶尔盆地中部地区钻井地层压力实测数据,勾画出该区超压顶界面的空间分布形态以及超压封闭层的厚度;重点阐述了2口钻井超压封闭层的岩性构成、成岩作用机理和岩石学与岩石物性特征;通过对比研究,探讨了封闭层的封闭机理。研究表明该区超压顶界面为一个向南倾斜的曲面,横向上可穿过不同的地层层面。超压封闭层由一组砂泥互层的碎屑岩组成,厚度约166～250m,砂岩含量大于50%。砂岩封闭层已达到晚成岩 A_2亚期阶段,自生高岭石、石英次生加大和碳酸盐胶结作用发育,主要与中下侏罗统煤系烃源岩成熟演化过程中排出的大量有机酸溶解铝硅酸岩及其自生矿物有关。封闭层砂岩为致密储层,渗透率<1.0md、孔隙度<10%,由于其内发生了天然气充注,气毛细管封闭成为封闭层的主要封闭机理。 相似文献
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The Cretaceous Bashijiqike Formation is the main gas-bearing strata in the northern structural deformation zone of Kuqa subbasin. The acidic dissolution of this formation arose at 5–4Ma, which corresponds to the late burial stage of the Bashijiqike Formation. Variability of interlayer due to rock composition is negligible. Differentiation of acidic dissolution in sandstones was controlled by difference in amount of exogenous acid fluid from underlying strata. For the absence of sedimentary and structural carrier system between the isolated sandstone reservoirs, most fluid-rock systems show relative sealing feature during later burial stage by sealing feature of formation pressure, geochemical characteristics of formation water and content of diagenetic products in sandstones. Variation of sealing effects for different fluid-rock systems is obvious. The pressure coefficient is inversely proportional to acidic dissolved porosity of sandstone reservoirs, indicating that the variation of sealing effects for fluidrock system mainly controls the differentiation of acidic dissolution. 相似文献
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通过对准噶尔盆地阜东斜坡带侏罗系三工河组的岩性组合、粒度分析和地震反射特征等方面的研究,认为储油砂体主要为浊积岩,岩性为灰色泥岩、灰色中砂岩和灰色粗砂岩夹砂砾岩.岩石成份成熟度和结构成熟度均较低,见典型鲍马沉积序列,浊积扇是不稳定三角洲前缘砂质沉积物向坡折带及深水盆地的再分配的结果.研究该区具有多个浊积扇体,其中阜16井已获得低产油气流,说明阜东斜坡带具有良好的勘探前景. 相似文献
19.
Luis A. Spalletti 《Geological Journal》1993,28(2):137-148
The Sierra Grande Formation (Silurian-Early Devonian) consists of quartz arenites associated with clast supported conglomerates, mudstones, shales and ironstones. Eight sedimentary facies are recognized: cross-stratified and massive sandstone, plane bedded sandstone, ripple laminated sandstone, interstratified sandstone and mudstone, laminated mudstone and shale, oolitic ironstone, massive conglomerate and sheet conglomerate lags. These facies are interpreted as shallow marine deposits, ranging from foreshore to inner platform environments. Facies associations, based on vertical relationships among lithofacies, suggest several depositional zones: (a) beach to upper shoreface, with abundant plane bedded and massive bioturbated sandstones; (b) upper shoreface to breaker zone, characterized by multistorey cross-stratified and massive sandstone bodies interpreted as subtidal longshore-flow induced sand bars; (c) subtidal, nearshore tidal sand bars, consisting of upward fining sandstone sequences; (d) lower shoreface zone, dominated by ripple laminated sandstone, associated with cross-stratified and horizontal laminated sandstone, formed by translatory and oscillatory flows; and (e) transitional nearshore-offshore and inner platform zones, with heterolithic and pelitic successions, and oolitic ironstone horizons. Tidal currents, fair weather waves and storm events interacted during the deposition of the Sierra Grande Formation. However, the relevant features of the siliciclastics suggest that fair weather and storm waves were the most important mechanisms in sediment accumulation. The Silurian-Lower Devonian platform was part of a continental interior sag located between southern South America and southern Africa. The Sierra Grande Formation was deposited during a second order sea level rise, in which a shallow epeiric sea flooded a deeply weathered low relief continent. 相似文献
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前人研究泥岩盖层封闭性时并没有考虑断裂的破坏程度,且对已被断裂破坏泥岩盖层封闭性演化史的研究目前尚未见到文献报道,而这些问题对含油气盆地断裂发育区油气勘探至关重要.在被断裂破坏泥岩盖层封闭机理及其封闭演化特征研究的基础上,通过比较泥岩盖层断接厚度与其封油气所需的最小断接厚度的相对大小,将被断裂破坏泥岩盖层封闭分为未被断裂破坏和已被断裂破坏泥岩盖层封闭2种,并通过泥岩盖层和断层岩古排替压力恢复,确定泥岩盖层封闭能力形成距今时间、断层岩开始压实成岩距今时间和封闭能力形成距今时间,建立了一套被断裂破坏泥岩盖层封闭性演化史的恢复方法,并将其应用于渤海湾盆地南堡5号构造被f2断裂破坏东二段泥岩盖层封闭性演化史的恢复中.结果表明:在L1、L3、L4、L5、L6、L7和L9测线处,f2断裂未破坏东二段泥岩盖层封闭,仍是东二段泥岩盖层封闭,其封闭性演化经历了不封闭和封闭阶段,目前具有较强的封闭能力.在L2和L8测线处f2断裂已破坏了东二段泥岩盖层封闭,为f2断裂断层岩封闭,其封闭能力演化经历了压实不封闭、成岩不封闭和成岩封闭3个阶段,目前也已具较强封闭能力,均有利于油气在东二段泥岩盖层之下储层中聚集与保存.与目前东二段泥岩盖层之下储层中已发现油气分布相吻合,表明该方法用于恢复被断裂破坏泥岩盖层封闭性演化史是可行的. 相似文献