歧口凹陷港西凸起物源特征及控砂机制分析  

Provenance characteristics and sand control mechanism of Gangxi uplift in Qikou sag

作　　者：牟延群 林常梅[2] 周静[2] 汪津[2] 杨艳[2] 孙博[2] 杨飞[2] Mou Yanqun;Lin Changmei;ZhouJing;Wang Jin;Yang Yan;Sun Bo;Yang Fei

机构地区：[1]中国石油大港油田公司第二采油厂 [2]中国石油大港油田公司勘探开发研究院

出　　处：《录井工程》2019年第1期93-101,140,141,共11页Mud Logging Engineering

摘　　要：为进一步明确渤海湾盆地歧口凹陷板桥高斜坡物源特征、控砂机制及油气成藏富集规律,通过地震、测井、岩心测试化验分析资料,采用源汇分析方法对港西凸起物源轻重矿物组合特征、沟槽输砂通道与沉积微相空间分布规律进行详细论述,并进一步总结板桥高斜坡控砂机制与油气成藏富集规律。研究认为,港西凸起作为板桥高斜坡主要物源,其在沙二段和东营组高位体系域(HST)沉积时期,凸起出露面积相对较大,物源供给能力增强,在地震剖面上能够识别出数个与近岸小型扇三角洲相对应的下切侵蚀沟槽,组成相对闭合的"源-渠-汇"系统,进一步总结出港西凸起沟槽控砂模式;同时,沙二段不整合面与港东、滨海断裂系组成的油气疏导系统使得该地区具备形成地层上倾尖灭油气藏、地层超覆油气藏和地层岩性油气藏3种油气成藏条件。针对该勘探目标区,实施多口探井,获得千万吨级探明储量,证实歧口凹陷港西凸起作为内部物源能够形成有利砂体并具备油气成藏条件,为下一步勘探指明了方向。To further clarify the provenance characteristics, sand control mechanism and hydrocarbon accumulation and enrichment regularity of Banqiao high slope in Qikou sag, Bohai Bay Basin, the source sink analysis methods are used to elaborate the provenance characteristics of light and heavy mineral assemblage, guttering sand transportation channel, spatial distribution regularities of microfacies in Gangxi uplift through seismic, well logging and core testing data. And the sand control mechanism and oil and gas reservoir accumulation and enrichment regularity of Banqiao high slope are further summarized. According to the study, Gangxi uplift, the main provenance of Banqiao high slope, its outcrop area is relatively large during the sedimentary period of the second member of Shahejie formation and Dongying formation in highstand system tract (HST), and provenance supply capacity enhanced. On the seismic section, several undercut erosion grooves corresponding to the near- shore small fan delta can be identified to form a relatively closed source-conduit-sink system. The authors further summarize sand control mode of guttering in Gangxi uplift. The area has three hydrocarbon accumulation conditions: hydrocarbon reservoirs with stratigraphic updip pinchout, the stratigraphic onlap hydrocarbon reservoir and stratigraphic and lithologic hydrocarbon reservoir because of the oil and gas drainage system consisting unconformity surface of the second member of Shahejie formation and Gangdong and Binhai rift systems. A number of exploration wells are implemented in this exploration target area and ten million tons of proven reserves are obtained. It is confirmed that Gangxi uplift in Qikou sag as an internal provenance can form favorable sand bodies and has hydrocarbon accumulation conditions. The study instructs the next exploration.

关 键 词：歧口凹陷 板桥高斜坡 源汇系统 控砂机制 油气成藏 

分 类 号：TE132.1[石油与天然气工程—油气勘探]