中拐凸起走滑断裂发育特征及对成藏的控制作用

The development characteristics of strike-slip faults and its control effect on reservoir accumulation in Zhongguai Uplift

武小宁 钟厚财 林煜 邓勇 朱哲 赵津 岳纹 刘振宇

中国石油集团东方地球物理公司研究院乌鲁木齐分院，新疆 乌鲁木齐 830016

Urumqi Branch of Geophysical Research Institute, BGP, CNPC, Urumqi 830016, China

中拐凸起侏罗系勘探程度低，具有良好的前景。利用新采集的“两宽一高”地震资料，对中拐地区燕山期断裂进行了精细刻画，首次明确了走滑断裂的发育特征，并多方位分析其对油气成藏的控制作用。研究结果表明：1）中拐凸起主要发育3排近东西向走滑断裂体系。其中，北部断裂体系规模最大，主要发育线性、拉分地堑、雁列、马尾状4种构造样式。2）走滑断裂对储层物性具有明显的控制作用，离走滑断裂越近，储层物性越好，尤其是渗透率呈指数级增加。3）花瓣侧向封堵条件好，成藏概率高。4）单井测试产量与钻井距走滑断裂距离呈负相关关系，主要是走滑断裂附近裂缝规模发育，可有效提高产量。综合分析得出：中拐凸起走滑断裂规模发育，并对储层物性、油气分布及测试产量具有明显的控制作用，下步勘探应以走滑断裂控制下的花瓣部位为主，且井点位置要靠近走滑断裂。

The Jurassic reservior in Zhongguai Uplift has a good prospect due to its low exploration degree. Based on the newly acquired seismic data of "two widths and one height", the Yanshanian faults in Zhongguai Area are described in detail, the development characteristics of strike-slip faults are defined for the first time, and the controlling effect of strike-slip faults on oil and gas accumulation is analyzed in multiple directions. The results show that: (1) three rows of nearly east-west strike-slip fault systems are mainly developed in Zhongguai Uplift, of which the northern part is the largest, mainly developing four structural styles of linear, pull-apart graben, echelon and horsetail; (2) strike-slip faults have an obvious control effect on reservoir physical properties, the closer to strike-slip faults are, the better reservoir physical properties are, especially the permeability increases exponentially; (3) the lateral sealing conditions of "petal" are good and the probability of  accumulation is high; (4) the test output of single well is negatively correlated with the strike-slip fault distance, mainly due to the development of fracture near the strike-slip fault, which can effectively improves production. Comprehensive analysis shows that the strike-slip faults are well developed in zhongguai uplift, and have an obvious control effect on reservoir physical properties, oil and gas distribution and measured output. The next exploration should be dominated by petal bagian controlled by strike-slip faults, and the well location should be close to the strike-slip faults.

10.6056/dkyqt202302014