张家垛油田阜三段异常压力特征分析

Analysis on abnormal pressure characteristics of the third member of Funing Formation in Zhangjiaduo Oilfield

近年来的勘探证实张家垛油田阜三段具有良好的油气潜力,其中已有多口井钻获工业油流,油层分布与异常压力密切相关。通过对埋藏史、沉积相以及基本地质特征分析,并结合测井、地震资料对该区异常高压进行研究,结果表明:该区的异常压力是由于欠压实作用造成,欠压实使作用于骨架颗粒上的有效应力变小,使深埋储层的压实作用程度小,储层粒间孔发育,储层物性好;张家垛地区纵向上存在2个异常压力带,阜三段位于下方异常压力带中,阜三段中的异常压力的分布呈东高西低的特点;张家垛地区阜三段中的异常压力,在断裂发育处相对较低,向凹陷中心有增加的趋势。以上研究成果表明深凹陷中心具备有效储层发育的条件,且已被近期的研究成果证实。

The third member of Funing Formation has been confirmed to have a great potential for oil and gas in recent exploration. Some wells have drilled to ubtain industrial oil flows already. ｜lowever, high production is closely related to abnormal high pressure. The analysis results of hurial history, sedimentary facies, well lugging and seismic data show thai the ahnomml high pressure is caused by the disequilihrium compaction. And due to the disequilihrium compaction, the effiective stress that effects on the sediments is reduced anti the inlergranular pore is protected. There are lwo abonnal pressure areas in vertical. Funing Fomnation is located in the lower area and it presents the charaeteristies that the pressure is higher in the east. In study area, the pressure is luwer where the fiacture is developed and inereases towards the centre of depression. The study indicates that high quality reserwir may exist in the centre of depression, which has been confirmed hy nearly study.