塔里木盆地库车坳陷中生界烃源岩生烃动力学参数研究   总被引：6，自引：4，他引：2  

李贤庆  肖贤明  米敬奎  唐永春  肖中尧  刘德汉  申家贵 《煤田地质与勘探》2005,33(4):35-39

根据封闭体系黄金管热模拟实验结果,应用Kinetics专用软件,研究了塔里木盆地库车坳陷中生界不同类型烃源岩的生烃特征与动力学参数。库车坳陷侏罗系煤、碳质泥岩、泥岩及三叠系湖相泥岩具有各自的活化能分布和频率因子,揭示出其生烃行为的差异性。利用GOR-IsotopeKinetics软件,推导了库车坳陷侏罗系煤、泥岩和三叠系湖相泥岩3类烃源岩的碳同位素动力学参数。上述参数的获取,为盆地模拟、烃源岩评价、生烃量计算及资源量预测提供了重要的基础地球化学数据。   相似文献   

库车坳陷克深气田致密砂岩储层构造裂缝形成序列与分布规律     

王珂  杨海军  李勇  张荣虎  杨学君  王俊鹏 《大地构造与成矿学》2020,(1):30-46

综合采用岩心、薄片和成像测井等资料,对库车坳陷克深气田白垩系巴什基奇克组构造裂缝的形成序列、分布规律和影响因素进行了研究。结果表明:剪切裂缝和张性裂缝在克深气田均有发育,以直立缝和高角度缝为主,主要形成于近南北向的挤压作用、背斜弯曲拱张作用和异常流体高压作用,微观裂缝切穿胶结物和部分颗粒,早期充填构造裂缝可在后期构造应力和异常流体高压作用下重新裂开成为有效裂缝。克深气田发育3期构造裂缝,其中第3期构造裂缝的形成时间与天然气大量充注期吻合,是工业规模性气藏形成的关键因素。单个断背斜高部位的构造应力低于背斜翼部,因此背斜高部位的构造裂缝线密度相对较低,但背斜弯曲变形使裂缝开度较大,有效性好,单井的无阻流量较高;翼部和断层附近构造裂缝线密度较大,但开度较小,有效性差;构造应力、岩石强度和变形时间的不同造成了构造裂缝特征在各气藏之间具有差异性。储层中部第3砂层组的构造裂缝发育程度中等,充填程度相对较低,并且平面上分布连续,可形成连片分布的储层“甜点”区,应成为克深气田开发中的重点层位。对克深气田构造裂缝起主要贡献作用的为水下分流河道和河口坝微相的粉‒细砂岩。  相似文献   

南盘江—右江盆地构造演化与金锑成矿作用     

杨成富  刘建中  顾雪祥  王泽鹏  陈发恩  王大福  徐良易  李俊海 《地球学报》2020,41(2):280-292

南盘江—右江盆地具独特的盆地构造演化历史和背景,是西南低温成矿域的重要组成部分,广泛发育有Au-As-Sb-Hg-Tl等低温热液矿床,金锑成矿作用与盆地构造演化密切相关。本文系统总结南盘江—右江盆地构造演化过程和历史,分析盆地演化对沉积地层、沉积相带分布、古地理变迁等的控制作用。盆地内金锑矿床受构造和有利岩性组合控矿明显,结合南盘江—右江盆地内Cu-W-Sn-Pb-Zn-Au-Sb-Hg等矿床空间分布特征及规律,探讨盆地构造演化与金锑成矿作用和成矿效应的关系。类比斑岩-矽卡岩-浅成低温热液型多金属矿床最新研究成果,建立南盘江—右江盆地以陆内斑岩型铜矿床为中心,上部或边部矽卡岩型铜矿床、脉状钨-锡-银-铅-锌矿床和远端低温热液金-银-锑-汞矿床的找矿预测模型,模型对南盘江—右江成矿区深部斑岩型矿床或与斑岩体有关的矽卡岩型矿床的找矿勘查具有重要意义。  相似文献   

Nanpanjiang basin: A window on the tectonic development of south China during Triassic assembly of the southeastern and eastern Asia     

《Gondwana Research》2020

As the largest siliciclastic sink in the South China block, the Triassic Nanpanjiang basin is generally thought of as a foreland basin related to Indosinian collision between the South China and Indochina blocks. Our basin analysis, spanning an eight years period, provides details of Lopingian to Middle Triassic stratigraphic fill and tectonic subsidence of the basin. Field observation and sedimentological analyses reveal that the basin was not filled by a monotonous turbidite system and suggest instead the development of five primary depositional units constituted by deep-water turbidite systems, mass-transport deposits, condensed drapes, shallow-water isolated carbonate platforms, and volcano-volcaniclastic rocks. The stratigraphic completeness of the basin, the coexistence of widespread but localized carbonate platforms within axially filled deep-water basin, tectonically generated cyclothems of transverse mass-transport deposits along intrabasinal faults and basin fill of extrusive rocks of bimodal composition together apparently call in question the claim that crustal shortening prevailed during the Late Permian to pre-Norian Triassic. Patterns of basin fill, differential tectonic subsidence and very high subsidence rate of the region adjacent to master fault are more closely match the pattern expected for extensional to transtensional basin in a back-arc setting. The crustal extension in the southwestern South China was not consistent with hypothesized Indosinian collision between South China and Indochina blocks, but more likely developed in response to northwestward subduction of the paleo-Pacific plate. Our results, combined with regional considerations, lead to a new model for the Triassic tectonic evolution of South China during Triassic assembly of the southeastern and eastern Asia.  相似文献   

Geochemical characteristics and sedimentary environment of the Middle Devonian organic-rich shales in the Northwest of Guizhong Depression,Southwest China     

《China Geology》2020,3(4):567-574

In order to figure out the redox conditions and paleo-sedimentary environment of the Middle Devonian shales in the northwest of Guizhong Depression, the trace element analysis was conducted on the Middle Devonian cores (320.35–938.50 m) of the typical shale gas investigation well (GY-1) at a 1.50 m sampling interval through X-ray fluorescence spectroscopy (XRF) and inductively coupled plasma mass spectrometry (ICP-MS). According to the test result, the average values of V/(V+Ni), V/Cr and Ni/Co in Nabiao formation (Fm.) are larger than 0.67, 4.65 and 7.71 respectively, and Nabiao Fm. is rich in biological assemblages such as tabasheer, ammonite, etc. These evidences indicate the rising sea level rose relatively in the sedimentation period of Nabiao Fm. and a deepwater shelf environment, which was favorable for the preservation of organic matters. The V/(V+Ni), V/Cr and Ni/Co in Luofu Fm. and Tangting Fm. are 0.38–0.65, 0.73–4.10 and 3.70–6.72 respectively, indicating that the sea level dropped relatively in their sedimentation period, during which the water bodies became shallow, and the sedimentary environment was a weak oxidizing shallow water shelf environment. In addition, the variation of TOC has a high correlation with the enrichment degree of Ba element, indicating the favorable conditions for the enrichment and preservation of organic matters under an oxygen-deficient environment. Moreover, according to the identification of trace element indexes, the northwest of Guizhong Depression experienced the sedimentary cycle of relative rise to relative fall of sea level from bottom to top in the Middle Devonian sedimentation period. The relative sea level rose to the highest in the sedimentation period of Nabiao Fm., in which the organic-rich shales with stable thickness and high organic content were deposited. Hence, the Nabiao Fm. could be regarded as the favorable exploration target interval in this area.  相似文献   

Sequence stratigraphic framework and sedimentary model of Shanxi Formation in northeast Zhoukou Depression of the North China Plate     

《China Geology》2020,3(4):575-590

The sequence stratigraphic framework of Shanxi Formation in the northeast Zhoukou Depression was established based on detailed sequence stratigraphical and sedimentological analysis by utilizing the logging and core data of six wells drilled in the eastern tectonic unit of Zhoukou Depression. It was divided into three third-order sequences, namely SQs1, SQs2, and SQs3 from bottom to top. Each sequence can be divided into a transgressive system tract (TST) and a highstand system tract (HST). Furthermore, four sequence boundaries and three maximum flooding surfaces were identified, and they are the bottom interface SBs and maximum flooding surface mfss1 of SQs1, the bottom interface SBs1 and maximum flooding surface mfss2 of SQs2, the bottom interface SBs3 and maximum flooding surface mfss3 of SQs3, and the top interface SBx from bottom to top. Carbonate tidal flat –clastic tidal flat sedimentary system developed in Shanxi Formation in the northeast Zhoukou Depression (also referred to as the study area) under the control of regression. Meanwhile, four sedimentary microfacies were identified in the sedimentary system, which are lime-mud flats, sand flats, mixed flats, and mud flats. The transgression in the study area occurred from the southeast to the northwest. Therefore, the northwestern part is the seaward side, and the southeastern part is the landward side. As revealed by relevant drilling data, SQs1 of the Shanxi Formation is characterized by the development of limestone and carbonaceous mudstone, with limestone, dark mudstone, and carbonaceous mudstone mainly developing. Meanwhile, lime-mud flats were mainly deposited in it. During the periods of SQs2 and SQs3, the sedimentary environment of the study area changed from the carbonate tidal flats to clastic tidal flats as the coastline migrated towards the sea. In these periods, sand flats mainly developed near the maximum flooding surfaces and were relatively continuous in the eastern and southern parts of the transgressive system tract; mixed flats were relatively continuous in the western and northern parts of the transgressive system tract as well as the eastern and southern parts of the highstand system tract; mud flats widely developed in the highstand system tract. Peat flats mainly developed in the period of HSTs2, with coal seams relatively developing in the southeastern part of the study area as revealed by drilling data. The peat flats in SQs2 are favorable hydrocarbon source layers, the lime-mud flats in SQs1 and sand flats formed in the transgression periods of SQs2 and SQs3 constitute favorable hydrocarbon reservoirs, and the mud flats form in the transgressions periods serve as favorable cap rocks. Therefore, the study area features a reservoir-cap assemblage for self-generating and self-storing of hydrocarbon, and the southeastern part of the study area can be taken as a favorable exploration area.  相似文献   

渤海湾盆地西部凹陷南段成岩相分析与优质储层预测   总被引：14，自引：0，他引：14  

孟元林  高建军  刘德来  牛嘉玉  孙洪斌  周玥  鞠俊成  王粤川 《沉积学报》2006,24(2):185-192

储层实测孔隙度、普通薄片、铸体薄片和扫描电镜的资料表明,渤海湾盆地辽河坳陷西部凹陷南段新生界储层在纵向上发育三个次生孔隙带。从而在一个普遍低孔渗背景下,形成了孔隙度相对较高的优质储层。优质储层的形成和分布主要受沉积微相和成岩作用的影响与控制。他们形成于河口坝、辫状分流河道以及心滩沉积微相,目前处于早成岩阶段B期—中成岩阶段A1亚期,发育溶蚀成岩相。该文通过模拟古地温、镜质组反射率、甾烷异构化率和自生石英含量随时间的变化规律,预测了西部凹陷南段成岩阶段和成岩相的横向展布。通过成岩相图和沉积相图的叠合,预测了沙三中亚段优质储层的分布。预测结果表明,优质储层主要发育于斜坡区的中部。  相似文献   

东营凹陷波动古湖相烃源岩沉积特征   总被引：6，自引：2，他引：4  

陈中红  查明  金强 《湖泊科学》2006,18(1):29-35

以东营凹陷牛38井为例,研究显示,该井沙河街组沙三段烃源岩的沉积特征具有明显的波动性．宏观上体现为, 构造因素控制湖盆的整体升降和沉积构造旋回,但季节性气候及其它因素的影响使湖盆呈现次级旋回的复合性沉积．微观上表现为纹层的不连续性及生物扰动构造等事件性沉积.古湖面不同幅度的波动和变化导致相对稳定的泥岩沉积的不稳定性,有机质的分布也呈现较显著的非均质性．湖泊的沉积过程影响了微量元素、有机质以及烃源物质的分布,水体较深、盐度较高的沙三段下部多数微量元素含量较高以及B／Ca、Sr／Ba呈现高值;水体较浅、盐度较低的沙三段中部各元素的分布较为稳定,B／Ca、Sr／Ba比值及Sr的含量均显著降低.波动性沉积导致烃源岩呈现明显的优劣性分布,沙三段下部中的有机质富集,为优质烃源岩;沙三段中部的有机质分布较为分散,生排烃的资源潜力有限．  相似文献   

徐家围子断陷深层火石岭组致密火山岩储层地应力分布规律研究   总被引：4，自引：4，他引：0  

毛哲  曾联波  秦龙卜  祖克威  刘国平  田鹤 《地质力学学报》2018,24(3):321-331

徐家围子断陷位于松辽盆地北部,其深层中生代火石岭组为致密火山岩气藏,天然裂缝发育,地应力分布非均质性强。结合诱导裂缝法与井径崩落法进行单井现今地应力方向分析,利用声波测井法计算现今地应力大小的纵向分布。依据火石岭组构造顶底面图、火山岩相组及断层分布特征建立非均质三维地质模型;在动、静态岩石物理参数拟合校正的基础上,结合实验测试及已有研究成果,确定不同岩相组和断层岩石物理参数,建立三维力学模型;利用Ansys有限元数值模拟软件建立火石岭组三维数学模型并进行相关运算获得三维现今地应力分布模型。计算结果表明在火石岭组地层中,水平最大主应力方向主要为东西向,应力值范围在86~110 MPa;水平最小主应力方向主要为南北向,应力值范围在67~84 MPa。分析模拟结果可知火山岩相、断层和构造起伏三者对火石岭组现今地应力分布影响较大。其中水平主应力的方向主要受断层和近火山口相分布的影响,而水平主应力的大小则是受三者综合作用。在构造低部位,近火山口相组发育处,断层上盘及断层端部皆为主应力的集中区域。依据现今地应力研究成果可为徐家围子断陷下一步开发井网部署、压裂改造方案和水平井的设计以及注水管理提供重要指导。   相似文献   

库车坳陷依奇克里克地区下侏罗统阿合组致密砂岩储层的成岩差异性特征研究     

张立强  严一鸣  罗晓容  王振彪  张海祖 《地学前缘》2018,25(2):170-178

塔里木盆地库车坳陷依奇克里克地区深层致密砂岩储层的非均质性强,成岩成藏过程复杂。根据岩心观察、薄片鉴定、流体包裹体、荧光特征及碳氧同位素等分析,对下侏罗统阿合组致密砂岩的岩石类型、成岩演化及其差异性特征进行了研究。研究表明,阿合组致密砂岩分为强钙质胶结砂岩(C类)、富刚性颗粒岩屑砂岩(A类)、含塑性颗粒岩屑砂岩(D类)、富塑性颗粒岩屑砂岩(B类)4类,经历了两期油气充注,不同类型砂岩的成岩、致密化及成藏过程差异明显。A类砂岩的构造缝及溶蚀孔隙均较发育,渗透率较高、孔隙度分布范围广,代表第二期油气充注的蓝色荧光强。D类砂岩的长石及软岩屑含量稍高,晚期溶蚀作用发育,孔隙度较高、渗透率低,黄色和蓝色荧光共存。A、D两类为有效的致密气藏储层,成岩、成藏过程有差异,D类砂岩早期与晚期油气充注共存,早期油气充注减缓后期压实和碳酸盐胶结作用的发生,有利于晚期酸性溶蚀及油气充注。A类砂岩裂缝发育,对储集性能的影响大,渗透性好,晚期油气充注受早期油气充注的影响小。  相似文献