断陷盆地继承性斜坡断砂耦合控藏机制——以沧东凹陷南皮斜坡孔二段为例  

The reservoir control mechanism by fault-sand coupling in faulted basin and its exploration discovery:A case study of the Member 2 of Kongdian Formation in Nanpi slope of Cangdong Sag,Bohai Gulf,China

作　　者：刘子藏[1] 周育文[1] 杨朋[1] 邵徽发 牟连刚[1] 林伶[1] 袁雪花[1] LIU Zicang;ZHOU Yuwen;YANG Peng;SHAO Huifa;MU Liangang;LIN Ling;YUAN Xuehua(Exploration and Development Research Institute of Dagang Oilfield,CNPC,Tianjin 300280,China)

机构地区：[1]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《成都理工大学学报（自然科学版）》2020年第6期645-651,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国石油天然气股份有限公司重大科技专项(2018E-11-02)。

摘　　要：探讨渤海湾盆地沧东凹陷南皮斜坡孔店组第二段断砂耦合控藏机制,为在继承性斜坡寻找油气提供理论依据。分别从断裂和砂体两方面入手,开展构造解析与斜坡演化研究,明确断裂发育特征;开展斜坡控砂特征研究,分砂组明确砂体展布特征。在此基础上,根据斜坡差异演化特点剖析不同斜坡部位断砂耦合特征,结合成藏时空匹配关系与油源疏导体系确定断砂耦合控藏机制。结果表明,断砂耦合与成藏期次的匹配关系决定了南皮斜坡勘探有利区带,主干断层与砂体组合共同控制油气疏导、早断晚衰的次生断层与砂体耦合控制油气聚集。斜坡东带伸展走滑断裂系统在中新生代持续发育,与孔二段砂体耦合形成断砂耦合控藏区。其中孔二段源外的高斜坡区形成“古生新储”油气成藏区,孔二段源内中低斜坡可形成双源油气成藏区;斜坡西带断裂相对不发育,为岩性油气藏发育区,孔二段源内中斜坡区形成“自生自储”油气成藏区。高斜坡“古生新储”成藏区部署的Ying101X1井获高产凝析油气流,拓展了孔二段勘探领域。The reservoir control mechanism of fault and sand coupling in the second member of the Kongdian Formation(E k 2)in Nanpi slope of Cangdong Depression in Bohai Bay Basin is discussed in order to provide a theoretical basis for oil and gas exploration on inherited slopes.Structural analysis and slope evolution study are carried out from the two aspects of fault and sand body respectively to clarify the fault development characteristics.The characteristics of slope sand control are studied and the distribution characteristics of sand bodies are determined by sand groups.On this basis and according to the characteristics of slope evolution difference,the characteristics of sand-fault coupling at different slope positions are analyzed,and the reservoir control mechanism of sand-fault coupling is determined by combining the reservoir-forming space-time matching relationship and oil source dredging system.The results show that the matching relationship between the fault-sand coupling and the accumulation period determines the Nanpi slope favorable exploration zone.The combination of main faults and sand bodies together controls the coupling of secondary faults and sand bodies with oil and gas drainage,and the early-failure and late-decay faults together with sand bodies control oil and gas accumulation.It is considered that the extensional strike-slip fault system in the eastern belt of the slope continued to develop in the Mesozoic-Cenozoic and was coupled with the sand body of E k 2 to form a fault-sand coupling reservoir-controlling area.Among them,the high slope area outside the source of E k 2 forms a“Paleogenetic-source reservoir”,the middle and low slopes in the source of E k 2 can form a dual source oil and gas accumulation area and the middle slope in the west belt where the faults is relatively undeveloped forms a lithologic reservoir development area.At present,the Well Ying101X1 occurred in the high-slope“Paleogenetic-source reservoir”area has achieved high-yield condensate gas flow and expanded the

关 键 词：沧东凹陷 南皮斜坡 继承性斜坡 古地貌控砂 断砂耦合 古生新储 

分 类 号：TE122.31[石油与天然气工程—油气勘探]