川西坳陷东坡沙溪庙组天然气优势运移通道研究

发布时间：2018-01-25 13:51

本文关键词： 川西坳陷东坡构造演化砂体连通性油气运移模拟　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：川西坳陷是龙门山构造带挤压推覆运动而形成的前陆盆地,川西坳陷东坡是川西坳陷的一个次级构造,研究区包括合兴场-丰谷构造、知新场-石泉场构造、中江-回龙构造和黄鹿向斜构造四个次级构造。川西坳陷东坡受到多次构造运动影响,发育大量断裂。川西坳陷东坡沙溪庙组是一套陆相碎屑岩,不能产生油气,但下伏地层须五段和须三段都是较好的烃源岩层。研究过程中,利用2DMove软件恢复川西坳陷东坡构造演化过程,川西坳陷东坡构造演化主要表现为:燕山期构造运动挤压构造应力为近东西向,形成川西坳陷东坡南北向构造带的初期形态,地层发育大量断层,形成早期的断背构造圈闭。其中地层南边与西边较厚,北边和东边较薄。而喜山期东西向大规模的构造应力挤压,使地层变形、错断、抬升,合兴场-知新场构造进一步隆升定形。利用泥岩声波时差法计算剥蚀厚度,东坡地区喜山期剥蚀厚度具有从西到东,由南到北呈现由高到低的总体趋势。研究工作以油气优势运移通道综合预测技术为基础,基于ArcGIS平台,开展油气优势运移路径研究。研究过程中,应用流体包裹体测温、生排烃史分析、埋藏史和热史分析等多种测试分析数据,结合现有成果认识,综合确定成藏期次和关键时刻。分析断裂输导体系和砂体输导体系,确定断-砂-源空间匹配关系,借鉴油气分布和钻录井显示特征,结合储层孔隙演化史、断层活动史等分析成果,研究川西坳陷东坡成藏关键时刻输导格架空间组合样式并建立地质概念模型,构建输导格架的空间数值模型。阐明成藏关键时刻的油气运移动力、通道及排烃模式,建立初始地质模型。应用基于概率模型的油气运移数值模拟技术,应用油水分布、油气显示分布、地质分析成果等资料检验,验证油气天然气优势通道运移路径分布成果,寻找分布规律及其主控因素,最终推测燕山末古气藏特征。
[Abstract]:West Sichuan depression is a Foreland basin formed by compressional and nappe movement of Longmenshan structural belt. The east slope of west Sichuan depression is a secondary structure of western Sichuan depression. The study area includes Hexingchang-Fenggu structure and Zhixinchang-#china_person0# field structure. Zhongjiang-Huilong structure and Huanglu syncline structure are four secondary structures. The east slope of west Sichuan depression is affected by many tectonic movements and a large number of faults are developed. The Shaximiao formation in the east slope of the western Sichuan depression is a set of continental clastic rocks. Oil and gas can not be produced, but both the fifth member and the third member of the underlying strata are better source rocks. In the course of the study, the tectonic evolution process of the east slope of the western Sichuan depression was restored by using 2DMove software. The tectonic evolution of the east slope of the western Sichuan depression mainly shows that the compressive tectonic stress of the Yanshanian tectonic movement is nearly east-west, forming the initial shape of the south-north structural belt on the east slope of the western Sichuan depression, and a large number of faults are developed in the strata. The early faulted structural traps were formed. The south and west sides of the strata are thicker, the north and east side are thinner. However, during the Himalayan period, the large-scale tectonic stress squeezing in the east-west direction causes the strata to be deformed, faulted and uplifted. The Hexingchang-Zhixin field structure is further uplifted and the denudation thickness is calculated by using the mud sonic moveout method. The denudation thickness of the Himalayan period in the Dongpo area is from west to east. The research work is based on the comprehensive prediction technology of oil and gas dominant migration channel, based on the ArcGIS platform, the research of oil and gas dominant migration path is carried out. Based on the data of fluid inclusion temperature measurement, hydrocarbon generation and expulsion history, burial history and thermal history analysis, and combined with the existing results, it is recognized that the temperature measurement of fluid inclusions, hydrocarbon generation and expulsion history, burial history and thermal history analysis. The reservoir forming period and critical time are determined synthetically. The fault transport system and sand body transportation system are analyzed, the matching relationship between fault and sand source space is determined, the oil and gas distribution and logging display characteristics are used for reference, and the pore evolution history of reservoir is combined. Based on the analysis of fault activity history, this paper studies the spatial assemblages of the transport grid at the key time of reservoir formation on the east slope of the western Sichuan depression and establishes the geological conceptual model. The spatial numerical model of the transport grid is constructed, the hydrocarbon migration dynamics, channels and hydrocarbon expulsion models at the key time of reservoir formation are clarified, the initial geological model is established, and the numerical simulation technology of oil and gas migration based on probability model is applied. Oil and water distribution, oil and gas display distribution, geological analysis and other data are used to verify the migration path distribution results of oil and gas dominant channels, and to find out the distribution law and its main control factors. Finally, the characteristics of the late Yanshanian paleo-gas reservoir were inferred.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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