高邮凹陷底辟构造与油气关系研究  

Relationship between diapir structure and hydrocarbon in Gaoyou Sag

作　　者：郑元财[1] 李东亮[1] 李储华[1] 杜二鹏[1] ZHENG Yuancai;LI Dongliang;LI Chuhua;DU Erpeng(Exploration and Development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)

机构地区：[1]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《复杂油气藏》2021年第3期8-13,共6页Complex Hydrocarbon Reservoirs

基　　金：江苏油田科技项目《苏北盆地低勘探发现领域潜力分析及预探目标研究》基金资助项目(JS20003)。

摘　　要：底辟构造是岩浆岩重要的成圈类型,是油气聚集的重要场所。高邮凹陷的底辟构造主要发育盖层断层型底辟构造和基底型底辟构造两种类型,其分布分别受盖层断层发育位置及基底形态所控制,底辟构造的形成与基底长轴方向、盖层断层走向具有空间上的“位态”耦合关系。利用地球物理反射特征、核上层伴生断裂、底辟核的厚度与顶面关系等组合特征,开展高邮凹陷底辟构造的识别,并进行油气成藏配套关系分析,认为岩浆侵入形成底辟构造过程对油气成藏具有建设和破坏两种作用,其中早于或同步于三垛期形成的底辟构造是油气良好的汇聚场所,是勘探有利地区,而晚于三垛期形成的底辟构造对油气成藏不利。Diapir structure is an important type of magmatic rock formation and an important place for oil and gas accumulation.Through the study of the diapir structure in the Gaoyou Sag,it is found that there are two types of caprock fault type diapir structure and basement type diapir structure developed in this area.Their distribution is respectively controlled by the development position of the caprock fault and the shape of the basement.The formation of the diapir structure has a spatial“position”coupling relationship with the direction of the long axis of the basement and the direction of the caprock fault.With the combination of geophysical reflection characteristics,associated faults in the upper core,and the relationship between the thickness of the diapir core and the top surface,the diapir structure of GaoyouSag was identified,and the matching relationship of oil and gas accumulation was analyzed.It is believed that the process of magma intrusion and formation of diapir structures has both construction and destruction effects on oil and gas reservoirs.Among them,diapir structures formed earlier or synchronously with the Sanduo period are good gathering places for oil and gas and are favorable areas for exploration.While diapir structures formed later than the Sanduo period are unfavorable for hydrocarbon accumulation.

关 键 词：底辟构造 侵入岩 成因机制 盖层断层 基底形态 高邮凹陷 

分 类 号：TE132[石油与天然气工程—油气勘探]