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1.
Sequence stratigraphic controls on reservoir characterization and architecture: case study of the Messinian Abu Madi incised-valley fill, Egypt 总被引：1，自引：0，他引：1
Understanding sequence stratigraphy architecture in the incised-valley is a crucial step to understanding the effect of relative sea level changes on reservoir characterization and architecture. This paper presents a sequence stratigraphic framework of the incised-valley strata within the late Messinian Abu Madi Formation based on seismic and borehole data. Analysis of sand-body distribution reveals that fluvial channel sandstones in the Abu Madi Formation in the Baltim Fields, offshore Nile Delta, Egypt, are not randomly distributed but are predictable in their spatial and stratigraphic position. Elucidation of the distribution of sandstones in the Abu Madi incised-valley fill within a sequence stratigraphic framework allows a better understanding of their characterization and architecture during burial. Strata of the Abu Madi Formation are interpreted to comprise two sequences, which are the most complex stratigraphically; their deposits comprise a complex incised valley fill. The lower sequence (SQ1) consists of a thick incised valley-fill of a Lowstand Systems Tract (LST1)) overlain by a Transgressive Systems Tract (TST1) and Highstand Systems Tract (HST1). The upper sequence (SQ2) contains channel-fill and is interpreted as a LST2 which has a thin sandstone channel deposits. Above this, channel-fill sandstone and related strata with tidal influence delineates the base of TST2, which is overlain by a HST2. Gas reservoirs of the Abu Madi Formation (present-day depth ～3552 m), the Baltim Fields, Egypt, consist of fluvial lowstand systems tract (LST) sandstones deposited in an incised valley. LST sandstones have a wide range of porosity (15 to 28%) and permeability (1 to 5080mD), which reflect both depositional facies and diagenetic controls. This work demonstrates the value of constraining and evaluating the impact of sequence stratigraphic distribution on reservoir characterization and architecture in incised-valley deposits, and thus has an important impact on reservoir quality evolution in hydrocarbon exploration in such settings. 相似文献
2.
通过对黔南坳陷和桂中坳陷的地层对比和分析,识别出了8种层序界面标志,共划分两个超(二级)层序SS1和SS2,并讨论了各体系域特征。在层序格架中对研究区内的储集体类型进行了总结,主要包括生物礁(滩)储集体、白云岩储集体和缝洞型储集体等3种类型。对层序格架中储集体的成因类型进行了总结归纳:有利的储集体主要有TST礁滩灰岩储集体、HST礁滩灰岩、白云岩储集体。 相似文献
3.
XU F ZHANG Penghui ZHANG Jinliang LIU Jinshui HOU Guowei ZHANG Ming LI Jingzhe LIU Shash GUO Jiaqi MENG Ningning 《《地质学报》英文版》2015,89(5):1625-1635
Gas-bearing deposits in the Lower Mingyuefeng Formation of Paleogene, Lishui Sag, East China Sea Shelf Basin consist of shoreface sandstones of the highstand systems tract (HST) and transgressive systems tract (TST), and deltaic sandstones of the lowstand systems tract (LST) and falling stage systems tract (FSST). Detailed petrographic observations suggest that the diagenetic features and related evolution of these deposits cannot be simply characterized and demonstrated in the depth domain. However, the occurrence of diagenetic minerals systematically depends on the studied interval within the HST, TST, LST, and FSST; therefore, diagenesis in this region can be better constrained when studied in the context of the depositional environments and sequence stratigraphic framework. The eogenetic processes in such settings include: (1) microcrystalline siderite precipitated as concretions in almost all environments and systems tracts, which inhibited further mechanical compaction; (2) grain dissolution and kaolinitization occurred in shoreface HST sandstones and deltaic LST and FSST sandstones; (3) glaucony was locally observed, which did not clearly reflect the controls of facies or sequence stratigraphy; and (4) cementation by pyrite aggregates occurred in the shoreface HST sandstones and deltaic LST sandstones. The mesogenetic diagenesis includes: (1) partial conversion of kaolinite into dickite in deltaic LST sandstones, and minor chlorite cementation in deltaic FSST sandstones; (2) transformation of kaolinite into illite and quartz cementation in deltaic LST and FSST sandstones; (3) frequent precipitation of ankerite and ferroan calcite in shoreface TST sandstones and early HST sandstones, forming baffles and barriers for fluid flow, with common calcite in shoreface HST sandstones as a late diagenetic cement; and (4) formation of dawsonite in the deltaic LST and FSST sandstones, which is interpreted to be a product of the invasion of a CO2-rich fluid, and acts as a good indicator of CO2-bearing reservoirs. This study has thus constructed a reliable conceptual model to describe the spatial and temporal distribution of diagenetic alterations. The results may provide an entirely new conceptual framework and methodology for successful gas exploration in the continental margins of offshore China, thus allowing us to predict and unravel the distribution and quality evolution of clastic reservoirs at a more detailed and reliable scale. 相似文献
4.
青海木里煤田外力哈达矿区侏罗系层序地层与聚煤作用 总被引：1，自引：0，他引：1
利用钻孔岩心数据,对青海北部木里煤田外力哈达矿区侏罗纪湖盆相陆源碎屑含煤岩系进行了层序地层学和聚煤作用的研究。研究区侏罗系共划分出5个三级层序及相应的体系域。在每个层序中,低位体系域由河道相或分流河道相灰白色粗砂岩、细砂岩组成,湖侵体系域由泛滥盆地相或分流间湾相砂质泥岩组成,高位体系域由湖泊相或分流间湾沼泽相泥岩和碳质泥岩组成。厚煤层主要形成于层序S1的湖侵体系域中期,高位体系域和低位体系域基本没有煤层发育。这主要是在湖侵体系域中期,由于可容空间增加速率与泥炭堆积速率相平衡,因此,在三角洲平原分流间湾环境易形成较厚的煤层。 相似文献
5.
层序地层学方法标志着沉积地质学最新的一次革命,作为多学科的方法融合,它把自源作用（来自沉积体系内部）和异源作用（来自沉积体系外部）分析,形成了统一模式来解释沉积盆地的演化和地层结构,并在油气勘探中得到广泛应用,这对于减少储层预测风险尤其有效。深水湖盆沉积砂体主要有三角洲前缘向深水斜坡的进积砂体、重力流砂体包括浊积水道砂体、浊积扇砂体和碎屑流砂体。非水道化的浊积砂体分布与盆地坡度、体系域演化密切相关,高坡度地区发育三角洲前缘向深水斜坡的滑塌浊积砂体,其他地区在湖侵早期和湖退晚期发育非水道化的湖底扇浊积砂体。层序体系域结构的重建和沉积机理的分析大大提高了沉积砂体的预测精度,减少储层预测风险。这些沉积砂体孔隙度低,渗透率也低,薄片观察发现极细砂为主。分选性中等,磨圆度次棱角状。碎屑成分主要为石英和石英岩岩屑,少许长石,另见方解石碎屑。胶结物主要为方解石。他们属于低孔低渗储集层,可以成为裂缝性油气藏和非常规油气资源的勘探目标。 相似文献
6.
Mohamed Ali Kalefa El-ghali Howri Mansurbeg Sadoon Morad Ihsan Al-Aasm Karl Ramseyer 《Sedimentary Geology》2006,190(1-4):323-351
The spatial and temporal distribution of diagenetic alterations has been constrained in relationship to depositional facies and sequence stratigraphy of the Upper Ordovician glaciogenic quartzarenite sandstones in the Murzuq Basin, SW Libya, which were deposited during the Haritanian glaciation when the basin was laying along the continental margin of Gondwana. Eogenetic alterations encountered include: (i) replacement of detrital silicates, mud matrix and pseudomatrix by kaolinite in paraglacial, tide-dominated deltaic, in foreshore to shoreface (highstand systems tract; HST) and in post-glacial, Gilbert-type deltaic (lowstand systems tract; LST) sandstones, particularly below the sequence boundaries (SB). Kaolinite formation is attributed to the influx of meteoric water during relative sea level fall and basinward shift of the shoreline. (ii) Cementation by calcite (δ18OVPDB = − 3.1‰ to + 1.1‰ and δ13CVPDB = + 1.7‰ to + 3.5‰) and Mg-rich siderite in the paraglacial, tide-dominated deltaic and foreshore to shoreface HST sandstones, in the glacial, tide-dominated estuarine (transgressive systems tract; TST) sandstones and in the post-glacial, shoreface TST sandstones is interpreted to have occurred from marine pore-waters. (iii) Cementation by Mg-poor siderite, which occurs in the post-glacial, Gilbert-type deltaic LST sandstones and in the paraglacial, tide-dominated deltaic and foreshore to shoreface HST sandstones, is interpreted to have occurred from meteoric waters during relative sea level fall and basinward shift of the shoreline. (iv) Pervasive cementation by iron oxides has occurred in the glacial, shoreface–offshore TST sandstones and post-glacial, shoreface TST sandstones immediately below the maximum flooding surfaces (MFS), which was presumably enhanced by prolonged residence time of the sediments under oxic diagenetic conditions at the seafloor. (v) Formation of grain-coating infiltrated clays mainly in the glacial, fluvial incised-valley LST sandstones and in the post-glacial, Gilbert-type deltaic LST sandstones as well as, less commonly, in the paraglacial, foreshore to shoreface HST sandstones and in the tide-dominated deltaic HST sandstones below the SBs.
Mesogenetic alterations include mainly the formation of abundant quartz overgrowths in the glacial, fluvial incised-valley LST sandstones, post-glacial, Gilbert-type deltaic LST sandstones and glacial, shoreface TST sandstones, in which early carbonate cements are lacking. Illite, chlorite and albitized feldspars, which occur in small amounts, are most common in the glacial, tide-dominated estuarine TST sandstones and paraglacial, shoreface HST sandstones. This study demonstrates that the spatial and temporal distribution of diagenetic alterations and their impact on reservoir-quality evolution in glacial, paraglacial and post-glacial sandstones can be better elucidated when linked to the depositional facies and sequence stratigraphic framework. 相似文献
7.
渤海湾盆地辽中凹陷旅大16油田东营组东三段是目前勘探开发的主力含油层系。综合三维地震资料、录井、测井及岩心资料,在井—震结合、层序地层学研究基础上,利用古地貌研究、岩心相、测井相、地震相和振幅属性切片分析,明确了东营组层序格架内沉积相类型、沉积展布特征及沉积演化规律。应用Vail的经典层序地层学理论,将东三段划分为一个三级层序,其中可识别出低位体系域、湖侵体系域和高位体系域。低位体系域沉积期,辽西低凸起大面积暴露遭受剥蚀,为研究区提供碎屑沉积物,发育近源的扇三角洲及重力流沉积体系。扇三角洲砂体以灰色中砂岩和细砂岩为主,河床滞留沉积、波状层理和生物扰动构造十分发育;高位体系域时期,辽西低凸起被淹没,供源能力减弱,研究区发育较远源的辫状河三角洲前缘沉积,且伴生重力流沉积。其中辫状河三角洲前缘水下分流河道砂体以细—中砂岩为主,见块状构造和楔状交错层理。重力流沉积体系主要为滑塌湖底扇及砂质碎屑流沉积,岩心观察可见细砂岩中发育滑塌变形构造,及漂浮状的砾石和泥岩撕裂屑。研究区沉积演化过程与地貌演化密切相关,且断裂体系对砂体展布具有控制作用,重力流沉积发育于断裂坡折前方。显然,明确沉积相类型、沉积展布特征及沉积演化规律,可为进一步油气勘探开发提供地质依据。 相似文献
8.
马勇 《沉积与特提斯地质》2002,22(4):61-66
川西坳陷侏罗系是川西浅层天然气勘探开发的主要目的层，气藏分布与蓬莱镇组中有利储层的展布密切相关。气藏预测的重点和难点主要在于对有利储层的准确预测。笔者运用层序地层学原理，建立起了川西坳陷上侏罗统蓬莱镇组的层序地层对比格架，经研究发现，有利储集砂体主要发育在中期基准面下降晚期和上升早期，通过分析砂体的沉积，测井，地震等标志，可以确定储层的主要沉积微相。利用储层的多种识别标志，特别是含气砂体的地震识别标志，有效地实现了对有利储层的横向预测。 相似文献
9.
结合在陆相盆地中的实例研究,将一个发育完整的陆相三级层序细分为4个体系域：低水位体系域（LST）、水进体系域（TST）、高水位体系域（HST）和水退体系域（RST）,称为I型层序。或者一个层序可以不发育低水位体系域,而由水进体系域、高水位体系域和水退体系域组成,称为II型层序。低水位体系域发生在湖平面（基准面）快速下降时期;水进体系域出现在首次湖泛面到最大湖泛面之间;高水位体系域形成在高水位时期的湖平面相对静止期;水退体系域形成在湖平面缓慢下降期,在沉积物供给速率大于可容空间增加速率时形成。一般低水位体系域发育小型进积式准层序组,纵向沉积环境变浅,在盆地边缘形成河流下切作用;水进体系域发育退积式准层序组,沉积环境自下而上明显变深;高水位体系域发育加积型准层序组,纵向沉积环境变化不大,且多为静水沉积;水退体系域发育大型进积式准层序组,沉积环境自下而上明显变浅,沉积体系向盆地中心推进。结合对松辽盆地的实例研究,分别阐述了断陷盆地和坳陷盆地中各不同体系域的油气藏分布规律：低水位体系域主要在断陷盆地的陡坡侧和坳陷盆地的深水区发育透镜状岩性油气藏;水进体系域主要在断陷盆地的陡坡带发育上倾尖灭型岩性油气藏,在缓坡带和坳陷盆地的斜坡带发育地层超覆油气藏;高水位体系域主要以深水区的透镜状岩性油气藏为主;水退体系域在断陷盆地中主要发育地层不整合遮挡油气藏,在坳陷盆地中主要发育断块油气藏以及断层遮挡油气藏。从而,以理论与实践相结合的方式,阐明了陆相层序四分体系域的实用性。 相似文献
10.
通过对塔里木盆地库车坳陷南天山山前带克孜勒努尔沟与依奇克里克野外露头沉积相的精细研究,结合山前带大量地震剖面分析与迪那201井、东秋5井等多口钻井测井相和岩心精细描述,将古近系库姆格列木群划分为2个层序。层序2低位域以冲积扇沉积为主,自湖侵体系域始,研究区广泛发育退积与进积型扇三角洲沉积。库姆格列木群层序2湖侵体系域内扇三角洲平原砂体以正韵律沉积为主,砂砾岩占地层厚度的(68.4～87)%;扇三角洲前缘砂体正、反韵律均有分布,砂砾岩占地层的百分比有所降低,为(55.2～77)%。高位体系域内主要发育以反韵律砂体为主的扇三角洲前缘沉积。古近系苏维依组只发育一个层序,其低位体系域的砂体为扇三角洲平原与前缘的分流河道砂体,湖侵体系域内扇三角洲前缘砂体正、反韵律均发育,高位体系域内主要发育扇三角洲前缘沉积,以反韵律砂体为主,正韵律砂体相对较少。对比苏维依组不同体系域内砂体储集性,湖侵域内砂体优于高位域内砂体。扇三角洲沉积体中有利储集砂体首选为湖侵体系域内的扇三角洲前缘水下分流河道和河口坝砂体,次之为低位域扇三角洲前缘(平原)分流河道砂体,最后是高位域内的河口坝及席状砂沉积砂体。特别要指出:低位体系域或者湖侵体系域底部发育的扇三角洲前缘(平原)分流河道砂体(底砂砾岩)被快速湖侵的较厚的暗色泥岩所覆盖,可形成较好储集场所。 相似文献
11.
吐哈盆地丘东凝析气田主力产层为中侏罗统西山窑组中部的砂岩层，可分为上气藏（X4-X5）和下气藏（X6-X9），上、下气藏的储集体虽然都是三角洲前缘的河口坝和分流河道砂体，但在储集物性、非均质性和砂体几何形态等方面存在明显的差异。本文通过基准面旋回的划分和沉积微相研究，指出上、下气藏因其所处的旋回位置及相分异作用不同，储层非均质性和砂体几何形态存在明显差异，上气藏储层物性明显优于下气藏。该研究表明，基于基准面变化的高分辨率层序地层学方法可有效地用于预测储层的纵横向分布，对油气藏开发部署有重要的指导意义。 相似文献
12.
四川盆地东北部长兴组层序地层与储层分布 总被引：52，自引：4，他引：48
四川盆地东北部的二叠系长兴组为一套碳酸盐岩地层。宣汉盘龙洞剖面详尽研究表明,长兴组可分为两个三级层序:第1层序的海侵体系域由开阔台地滩间相沉积组成,高位体系域为台地边缘礁滩相沉积;第2层序的海侵体系域为浅滩沉积,高位体系域为暴露浅滩相-蒸发潮坪相沉积。长兴组中层序界面主要有水下间断不整合面和暴露侵蚀不整合面两类,相当于PeterVail的II类层序界面。在层序地层研究的基础上,对长兴组储层的时空分布特点进行了系统研究。研究发现,储层与层序地层关系密切,储层主要发育在层序的高水位体系域中:礁滩相储层位于第1层序的高位体系域中,而暴露浅滩-蒸发潮坪储层则主要产在第2层序的高水位体系域中。长兴组层序地层格架图以及层序高水位体系域沉积相平面图的编制,成为预测储层二维空间分布的基础。结果表明,礁滩相储层分布于通江—开县碳酸盐台地的东西两侧,暴露浅滩-蒸发潮坪储层遍布于通江—开县的碳酸盐台地及其东西两侧地区之中。两个层序高位体系域中的储层岩石孔隙丰富,储集条件较好,分布面积较广,从而成为研究区域油气勘探的重要目的层。 相似文献
13.
通过对取芯井砂岩镜下特征及孔隙度渗透率变化的分析,研究了北黄海盆地东部坳陷下白垩统砂岩的成岩作用及其储层意义。结果显示,储层砂岩类型以长石砂岩、长石石英砂岩和岩屑石英砂岩为主,处于中成岩作用阶段的A亚期末期至B亚期早期。主要的成岩作用类型有压实作用、压溶作用、胶结作用、交代作用、蚀变作用、溶蚀作用和重结晶作用,主要孔隙类型有粒间孔隙、粒内孔隙、填隙物内孔隙和次生裂缝。长石砂岩是主要储层。压实作用、压溶作用、胶结作用和重结晶作用使砂岩孔隙度减小,降低了储层物性,起到破坏性作用;交代作用、蚀变作用和溶蚀作用使砂岩孔隙度增大,改善了储层物性,起到建设性作用。孔隙度和渗透率整体上由浅变深而呈现由大到小趋势,在深度为3 000~3 020 m和3 140~3 250 m时出现异常高值,孔隙度与渗透率的异常高值带是次生孔隙发育带。 相似文献
14.
Mohamed A.K. El-ghali Karima G. Tajori Howri Mansurbeg 《Journal of Geochemical Exploration》2006,89(1-3):87
Linking diagenesis to depositional facies and sequence stratigraphy can provide a better understanding of some of the parameters that control the spatial and temporal distribution of diagenetic alterations and of their impact on reservoir quality. A study of the paralic, glaciogenic sandstones of the Melaz Shuqran and Mamunyiat formations (Late Ordovician) of the Murzuq Basin, SW Libya, reveals that the distribution of diagenetic kaolin can be constrained within depositional facies and sequence stratigraphy. Eogenetic kaolinite was formed by the dissolution of unstable detrital grains as a result of influx of meteoric waters into: (i) glacial, fluvial incised-valley lowstand systems tract (LST), glacial, tide-dominated estuarine transgressive systems tract (TST) during formation of overlying sequence boundary, (ii) paraglacial, tide-dominated deltaìc highstand systems tract (HST), paraglacial, foreshore to shoreface HST during progradation and basinward shift of the shoreline and/or formation of overlying sequence boundary, (iii) postglacial, Gilbert-type deltaic LST sandstones during relative sea level fall. On the other hand, formation of kaolinite immediately below maximum flooding surfaces is attributed to dissolution of unstable detrital grains by organic acids that were presumably derived from thermal alterations of organic matter, possibly during mesodiagenesis. The transformation of eogenetic kaolinite into dickite during mesodiagenesis is probably a consequence of low αK+ / αH+ ratio in the pore waters due to the scarcity of detrital K-feldspars. 相似文献
15.
琼东南盆地宝岛地区层序地层和砂体展布特征分析 总被引：6，自引：1，他引：5
以层序地层学理论为基础,通过对地震和测井层序进行分析,在琼东南盆地宝岛地区第三系识别出14个地震层序,并分析了各层序的发育特征.总结了不同体系域砂体类型,对各体系域砂体的空间展布进行了详细分析.并指出有利砂体的分布特征:低水位体系域,砂体主要分布在低水位楔、斜坡扇和盆底扇;高水位体系域,主要分布在三角洲、扇三角洲、海底扇和峡谷水道.研究表明,以层序地层学理论为指导,划分层序和体系域,进而对有利砂体进行预测,对该地区油气勘探有重要指导意义. 相似文献
16.
泌阳凹陷基于层序地层格架的油气成藏模式 总被引：6，自引：4，他引：2
泌阳凹陷层序地层研究表明,油气藏与层序地层体系域关系密切:南部陡坡带上倾尖灭油气藏主要位于低位和高位体系域中;中央凹陷带岩性透镜体油气藏主要是低位特殊地质体和高位白云岩缝洞储层构成的油气藏;北部缓坡带与层序地层密切相关的是地层不整合油气藏及断层-不整合油气藏,断层-岩性、断鼻等油气藏在高位体系域较发育。此外,北部斜坡区存在低位三角洲以及湖扩体系域地层超覆油气藏和高位滑塌岩性体油气藏。结合泌阳凹陷层序地层特点和各种类型油气藏分布规律,总结了泌阳凹陷基于层序地层格架的油气藏成藏模式。油气成藏模式表明,深凹区环盐湖带是当前岩性-地层类隐蔽油气藏勘探的重点领域。这类隐蔽油气藏主要有低位特殊地质体、低位三角洲、湖扩体系域地层超覆、高位白云岩缝洞油气藏、高位浊积体、高位断层-岩性等潜在的岩性-地层油气藏。 相似文献
17.
阿克库勒地区三叠系层序地层学及储集砂体成因类型 总被引：8，自引：0，他引：8
〖HT5”H〗摘 要〖HTSS〗 通过钻测井资料、地震资料的地质综合研究,以及地面露头观察与实验分析,研究区内三叠纪反映湖平面变化的地层旋回性非常清楚。按层序划分的基本原则,在三叠纪地层中可识别出7个Ⅰ型层序边界,相应地划分出6个Ⅰ型层序。总体来说,在层序内部,低位体系域发育,它们构成了区内储集砂体的主体;而高位及湖侵体系域往往被上覆层序侵蚀,甚至剥缺。储集砂体的分布受层序格架的严格控制,主要储集砂体的成因类型包括低位早期的湖底扇沉积、低位晚期侵蚀沟谷的河流充填与滨湖沉积,以及高位期三角洲及滨湖滩、坝沉积。区域盆地格架研究表明,研究区三叠纪时期是位于库车前陆盆地系统的前隆及前隆后缘盆地的边缘,因此,湖平面相对升降变化导致了区内十分明显的地层旋回,这种旋回性直接控制了砂体的成因类型及其分布规律。 相似文献
18.
断陷湖盆陡坡带油气成藏类型及其分布规律探讨 总被引：1，自引：0，他引：1
断陷湖盆陡坡带油气生、储、盖层的发育与陆相层序中的体系域具有一定的成因联系,不同的陆相层序样式可构成不同的生、储、盖层组合,综合考虑陆相层序储集体类型及其特征,将断陷湖盆陡坡带油气成藏类型归纳为三大类,八亚类,十种。它们分别是：岩性上倾尖灭,岩性下倾尖灭,岩性透镜体,岩性相变,地层不整合,地层削截,地层超覆,地层退覆,构造－岩性复合,构造－地层复合等油气成藏类型,这些油气成藏类型在断陷湖盆陡坡带陆相层序各个体系域中的分布具不均衡性,以水进体系域为最,其次为水退休系域和高水位体系域,低水位体系域较少,从陆相层序各体系域中成藏类型的空间展布规律来看,水进体系域是陆相断陷湖盆陡坡带油气勘探的重要目的层段。 相似文献
19.
根据海平面升降而对海洋碳酸盐岩沉积划分的不同沉积体系域,和其准同生成岩作用之间存在着相关性,这种相关性可以通过不同体系域所发育的成岩作用类型体现出来。文章以塔里木盆地轮南古隆起下中奥陶统碳酸盐岩为例,把准同生成岩作用放在层序地层学格架范畴内来研究,总结了不同体系域内发育的成岩作用类型和特征,认为海侵体系域主要发育方解石胶结作用和白云石化作用,高位体系域主要发育有方解石胶结作用和大气淡水溶蚀作用等。在层序地层格架下进行成岩作用对比的结果表明,高位期以及海侵期下伏的前期高位期沉积,是有利的成岩作用改造层位,并在物性统计数据中得到了证明,为有利储集体的评价、预测提供了新的途径。 相似文献
20.
准噶尔盆地在侏罗纪为一振荡的泛盆,形成了多期不整合,以不整合为层序边界形成的层序地层单元与油气藏的分布富集密切相关。不整合上下的低位域、高位域发育冲积扇、河流、三角洲等储集性能较好的砂砾岩,湖侵域则以厚度稳定、分布广泛的湖相泥岩为主。考虑到准噶尔盆地侏罗系不整合发育的多期性、分布的稳定性以及层序地层单元对生储盖的控制作用,建立由不整合面及不整合面上下的低位域、高位域构成的不整合复合体,多期不整合复合体与湖侵域的泥岩相互叠置形成多套生储盖组合。不整合复合体对于油气的运聚成藏起重要作用,在不整合复合体内部形成多种类型的岩性地层圈闭。不同级别的不整合复合体控制着生、储、盖组合的空间分布与富集层位,不整合复合体内部的组成单元则决定了岩性地层圈闭的类型及分布。其中,不整合复合体的低位域、高位域发育的大型冲积扇、三角洲沉积体系控制岩性圈闭的分布,而不整合复合体内的地层尖灭线控制地层圈闭的分布。 相似文献