塔里木盆地顺托果勒地区奥陶系碳酸盐岩超压差异分布研究  

Differential overpressure distribution in Ordovician carbonates,Shuntuoguole area,Tarim Basin

作　　者：曾帅 邱楠生[1,2] 李慧莉[3] 马安来[3] 朱秀香[4] 贾京坤[1,5] 张梦霏 ZENG Shuai;QIU Nansheng;LI Huili;MA Anlai;ZHU Xiuxiang;JIA Jingkun;ZHANG Mengfei(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Northwest Oilfield Company,SINOPEC,rümqi 830011,China;Economics&Development Research Institute Company Limited,SINOPEC,Beijing 100029,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石化石油勘探开发研究院,北京100083 [4]中国石化西北油田分公司,新疆乌鲁木齐830011 [5]中国石化集团经济技术研究院有限公司,北京100029

出　　处：《地学前缘》2023年第6期305-315,共11页Earth Science Frontiers

基　　金：国家自然科学基金企业联合创新发展联合基金项目“海相深层油气富集机理与关键工程技术基础研究(U19B6003)”。

摘　　要：随着塔里木盆地深层勘探领域的不断突破,顺托果勒地区超深层碳酸盐岩层系发现了一系列与走滑断裂有关的异常高压油气藏,但其超压成因和分布规律却少有讨论。相较于伸展盆地与挤压型前陆盆地体系,克拉通内走滑断裂与地层压力关系的研究相对较少,同时碳酸盐岩储层强烈的非均质性也进一步加剧了超压分布的复杂性。本次研究根据钻井测试与生产动态资料,分析了顺托果勒地区压力分布特征与超压储层特征;结合流体包裹体恢复的古压力、天然气地球化学特征与断裂活动期次讨论了顺托果勒地区不同二级构造单元间异常压力的成因机制差异。结果表明,顺北缓坡和顺托低凸起地层超压为天然气充注与构造增压作用产生,而顺南缓坡地层超压主要受原油裂解生气影响。天然气的生成与断裂活动特征决定了顺南地区整体超压、顺北与顺托地区局部超压的分布格局,走滑断控储层的发育模式使得顺托果勒地区中下奥陶统储层压力系统呈现分割状发育特征。With the continual advancement in deep exploration in the Tarim Basin,a succession of anomalous high-pressure reservoirs associated with strike-slip faults have been discovered in the ultra-deep carbonate strata of the Shuntuoguole region,but the origin of the overpressure and its distribution pattern have rarely been discussed.Also,the relationship between strike-slip fault and formation pressure in cratons has seldom been studied compared to results for extensional basins and compressive foreland basin systems;whilst strong carbonate reservoir heterogeneity further complicates the overpressure pattern.In this study the characteristics of the present-day pressure field and the main features of overpressure reservoirs are analyzed based on data from drilling tests and production dynamics studies.Further,combined with paleopressure calculation(using fluid inclusions),gas geochemical characteristics and faults activity,the origin of overpressure and its differential distribution in secondary tectonic units of the Shuntuogole area are discussed.The results suggest that the overpressure in the Shunbei slope and Shuntuoguole low uplift is caused by gas charging and tectonic compression,with the former mainly affected by pyrolytic gas generation from crude oil cracking.The gas generation and faults activity determine the differential overpressure distribution,where overpressure occurs widely across the Shunnan area but only locally in the Shunbei and Shuntuoguole areas.The development pattern of the fault-associated reservoirs results in the division of the pressure system in the Shuntuoguole area.

关 键 词：顺托果勒低隆起 走滑断裂 深层碳酸盐岩 超压成因机制 差异分布机理 

分 类 号：TE122.2[石油与天然气工程—油气勘探]