摘要
东营凹陷下第三系烃源岩中普遍发育异常高压,根据对超压体系的地球化学行为分析后认为压实不均衡是形成沙三中异常高压的主要原因,生烃作用是形成沙四上超压的主要机制,而沙三下同时具备压实不均衡及生烃作用的双向增压效应。断裂沟通的砂岩体及构造背斜等是有利的勘探目标,超压泥岩体周围的透镜状砂体是隐蔽油气藏的潜在目标。
There exists over- pressure abroad in the source rocks in the Paleogene system,Dongying Depression.The over- pressure distributes mainly at the middle part and lower part of the Member 3 and the upper part of the Member 4 of Shahejie Formation.The characteristics of geochemistry in the over- pressure are that the over- pressure in the middle part of the Member 3 was caused by unequlibrium compaction,the over- pressure in the lower part of the Member 3 resulted from hydrocarbon generation, and the formation of the over- pressure in the upper part of the Member 4 was a result of both the unequlibrium compaction of source rocks and the hydrocarbon generation.The over- pressure systems form over- pressure fluid compartments (OPC),which control the hydrocarbon migration and accumulation.Episodic hydrocarbon- expulsion of OPC is very important for the formation of the oil and gas reservoirs in Dongying Depression. The sandstone bodies and anticlines communicated by faults are favorable exploration targets, and the enwrapped sandstone by the over- pressure source rocks is latent objects for oil exploration.
出处
《大庆石油地质与开发》
CAS
CSCD
2004年第3期11-13,共3页
Petroleum Geology & Oilfield Development in Daqing
关键词
东营凹陷
烃源岩
超压
地球化学
勘探
Dongying Depression
source rocks
over- pressure
geochemistry
exploration
