CAJ | 학술논문

运用盆地模拟方法对东营凹陷新生界地层异常压力演化特征进行分析,并结合油气成藏期次分析对异常压力演化与油气藏分布进行了研究。模拟结果显示：东营凹陷古近系沙四上亚段（Es4上）和沙三下亚段（Es3下）烃源岩地层中普遍发育异常压力,并以超压为主;异常压力演化具有波动性,总体上经历了早期形成、中期下降调整、晚期再次增大3个阶段,分别对应沙河街组—东营组沉积期、沉积间断构造抬升期和馆陶组—第四纪沉积期。通过超压演化与油气成藏期次分析发现,现今处于超压环境中的油藏,在成藏过程中未必处于超压环境。早期形成的异常压力为Es4上和Es3下部分烃源岩中油气向邻近的圈闭运移聚集提供了充足的成藏动力,并有利于油气藏的保存。
운용분지모의방법대동영요함신생계지층이상압력연화특정진행분석,병결합유기성장기차분석대이상압력연화여유기장분포진행료연구。모의결과현시：동영요함고근계사사상아단（Es4상）화사삼하아단（Es3하）경원암지층중보편발육이상압력,병이초압위주;이상압력연화구유파동성,총체상경력료조기형성、중기하강조정、만기재차증대3개계단,분별대응사하가조—동영조침적기、침적간단구조태승기화관도조—제사기침적기。통과초압연화여유기성장기차분석발현,현금처우초압배경중적유장,재성장과정중미필처우초압배경。조기형성적이상압력위Es4상화Es3하부분경원암중유기향린근적권폐운이취집제공료충족적성장동력,병유리우유기장적보존。
Basin modeling technology is applied to analyze distribution and evolution characteristics of abnormal pressure system of Cenozoic in Dongying Sag.Based on the analysis of hydrocarbon accumulation stages,the influence of reservoir pressure evolution on the hydrocarbon accumulation is studied.Numerical modeling result shows that abnormally high pressures occur in the third and fourth members（Es3 and Es4） of Eocene Shahejie Formation,and the pressures are mainly overpressure.The overpressure evolution in the sag is fluctuating and divided into three stages：original-forming,medium-declining adjustment and latest-raising stages,respectively corresponding to the stage of Shahejie to the final stage of Dongying Formation,the stage of uplifting and denudation,and the stage of Guantao Formation to Quaternary depositional stage.The study of overpressure evolution and hydrocarbon accumulation stages shows that the reservoir which is in the overpressure environment now may not be in overpressure environment when the hydrocarbon accu-mulation occurred.In the early time,the overpressure is favorable power for hydrocarbon migration and accumulation in the lithologic reservoir,and conducive to the preservation of lithologic reservoir.