阜康凹陷侏罗系压力系统特征及对油气分布的影响

Characteristics of formation pressure system and its effect on petroleum distribution
in Jurassic of Fukang Sag

 曾治平

 ZENG Zhiping

 （中国石化胜利油田分公司勘探开发研究院西部分院，山东 东营 257000）

 (Western Branch of Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC,
Dongying 257000, China)

 准噶尔盆地阜康凹陷及其周缘是盆内油气富集区之一，区内含油层系普遍发育异常高压。通过实测压力标定，结合有效应力方程计算区内砂岩和泥岩压力值，划分了4个超压系统，即头屯河组、西山窑组、三工河组、八道湾组超压系统，不同超压系统之间存在过渡带。通过油源对比和断裂活动演化研究，认为超压是断层再次活化输导的主要动力，它控制了含油层系的富集程度。

 The Fukang Sag and its periphery in the Junggar Basin are the oil and gas enrichment areas in the basin, and the oil layer generally develops abnormally high pressure. Four overpressure systems are classified through the measured pressure calibration combined with the effective stress equation which is used to calculate sandstone and mudstone pressure of the area. The four systems are Toutunhe Formation, Xishanyao Formation, Sangonghe Formation, Badaowan Formation overpressure systems, and there is a transition zone between different overpressure systems. Based on the oil source contrast and the fault activity evolution, it is considered that the overpressure is the main driving force of the re-activation of the fault and the main controlling factor of the enrichment of the oil-bearing layer.

10.6056/dkyqt201703009