松辽盆地北部全油气系统成藏模式与勘探潜力  

Hydrocarbon accumulation patterns and exploration potential of whole petroleum systems in northern Songliao Basin

作　　者：白雪峰 陆加敏[1,2] 李军辉 杨亮[1,2] 孙立东 付秀丽[1,2] 李笑梅 郑强[1,2] BAI Xufeng;LU Jiamin;LI Junhui;YANG Liang;SUN Lidong;FU Xiuli;LI Xiaomei;ZHENG Qiang(State Key Laboratory of Continental Shale Oil,Daqing 163712,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163712,China)

机构地区：[1]多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆163712 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2024年第3期49-61,共13页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“松辽盆地深部含油气系统研究”(2021DJ0205);中国石油天然气股份有限公司重大科技项目“松辽盆地及外围风险勘探领域和目标研究、工程技术攻关现场试验”(2023YQX10102)。

摘　　要：松辽盆地作为一个多套优质烃源岩大面积发育的大型陆相叠合盆地,由于受多期构造与沉积的复合控制和改造,油气藏富集规律复杂多样。为进一步落实松辽盆地北部油气成藏条件与勘探潜力,基于全油气系统新概念,将松辽盆地北部划分为2个全油气系统:以青山口组为生油岩,嫩江组为区域盖层的储盖组合,形成了常规油、致密油、页岩油多类型有序成藏的上部石油系统;以沙河子组为烃源岩,登娄库组为区域盖层的储盖组合,形成了营城组火山岩、沙河子组砂砾岩等多种气藏差异富集的下部天然气系统。以此为基础,研究了松辽盆地北部油气藏的基本油气地质条件、常规-非常规油气的共生特征与油气分布情况。上部石油系统青山口组源岩经过生烃增压、幕式排烃后,地层压力释放,页岩储层形成自封闭体系,内部干酪根持续生烃、油气原位成藏,形成大规模连续分布的“立体式”页岩油藏;扶余油层致密油受生烃增压作用的控制、油气向下“倒灌”,形成断裂下排-横向运移、源-储侧向对接充注成藏。下部天然气系统沙河子组源岩持续生烃,受源储关系、储层特征和输导通道等成藏要素的耦合控制,形成中央古隆起“源储叠置、不整合输导、淋滤层聚气、高部位富集”,营城组火山岩气藏“下生上储、深断裂通源、高部位聚气”和沙河子组致密气“自生自储、断裂控砂、超压控富”等3种成藏模式。研究成果对松辽盆地不同类型油气资源分布预测和勘探具有重要指导意义。As a huge continental superimposed basin with several sets of high-quality source rocks developed in a large area,Songliao Basin has reservoirs with complex and diverse enrichment laws due to composite control and reworking of multi-stages structure and sedimentation.In order to further determine accumulation conditions and exploration potential,northern Songliao Basin is divided into 2 whole petroleum systems based on new concept of whole petroleum system:upper petroleum system formed with orderly accumulation of several types including conventional oil,tight oil and shale oil,and reservoir-seal assemblage with Qingshankou Formation as source rock and Nenjiang Formation as regional cap rock;lower gas system formed with differential enrichment of various gas reservoirs,including volcanic rock of Yingcheng Formation and glutenite of Shahezi Formation,and reservoir-seal assemblage with Shahezi Formation as source rock and Denglouku Formation as regional cap rock.On this basis,basic petroleum geological conditions of reservoirs,coexistence characteristics and distribution of conventional-unconventional oil and gas in northern Songliao Basin are studied.After hydrocarbon generation pressurization and episodic hydrocarbon expulsion of source rocks in Qingshankou Formation of upper petroleum system,formation pressure is released.Oil and gas mainly migrated and accumulated in reservoirs with high porosity and permeability after discharged from source rocks,forming conventional reservoirs with oil and gas generation in lower part and storage in upper part,driven by buoyancy and taking faults as paths.Shale reservoir forms self-sealing system.Continuous hydrocarbon generation of internal kerogen and in-situ oil and gas accumulation lead to the formation of large-scale continuously distributed“volumetric”shale reservoir.Tight oil of Fuyu reservoir is controlled by pressurization effect of hydrocarbon generation,with oil and gas“backflowing”,accumulating by faulted downward expulsion-lateral migration and source-res

关 键 词：松辽盆地 全油气系统 青山口组 沙河子组 成藏规律 

分 类 号：TE122.1[石油与天然气工程—油气勘探]