镇泾地区地层异常压力与油气运聚关系

THE RELATION BETWEEN ABNORMAL PRESSURE AND OIL MIGRATION IN ZHENJIN REGION

针对镇泾地区长6～长8层位油气运聚方向不明确致使该区油气勘探受阻的现状，采用异常压力研究的新思路来寻找油气勘探认识上的突破口。利用声波测井资料制作近50口井泥砂岩压实曲线、计算每口井的压力系数，结合镇泾油田的地质背景，研究镇泾地区地层的压实特征及异常压力与油气成藏条件和运移成藏过程之间的关系，并将各种因素的时空配置关系有效地结合起来研究镇泾地区的成藏问题。对进一步论证鄂尔多斯盆地西南部延长组的勘探潜力有重要意义。

Aiming at the present situation in which,the indefinite hydrocarbon migration makes exploration be barried in Chang 6Aiming at the present situation in which,the indefinite hydrocarbon migration makes exploration be barried in Chang 6-Chang8 formations in Zhenjing area,a new idea researching abnormal pressure is used to explore the breakthrough in the recognition of hydrocarbon exploration.Sandstone and mudstone compaction curves of some 50 wells are depicted and pressure coefficient of every well is calculated by means of sonic logging data,the compaction characteristics of the formations in the area and the relations between abnormal pressure and the conditions of hydrocarbon accumulation,and the process of migration and accumulation are studied by combining the geological setting of Zhenjing Oilfield.The relations of time and space deplay are effectively integrated to study the formation of the reservoirs in the area,which is important to furtherly verify the explorative potential of Yanchang formation in southwestern Ordos Basin.