彰武断陷东部陡坡带断裂特征与控储模式

Fault Characteristics and Reservoir Control Model of Steep Slope Belt in the Eastern Zhangwu Area

郭丽彬 杜学斌 李祥权

GUO Libin DU Xuebin LI Xiangquan

中国石油化工股份有限公司江汉油田分公司勘探开发研究院，湖北武汉　430223 中国地质大学（武汉），湖北武汉　430074

Research Institute of Exploration and Development, Jianghan Oilfield Company, SINOPEC, Wuhan Hubei 430223, China China University of Geosciences, Wuhan Hubei 430074, China

多年来，彰武断陷油气勘探工作一直处于停滞不前的状态，但2019年彰武斜13井的成功使得该区域重新燃起了希望。此文在现有资料的基础上，结合区域构造演化背景，对彰武断陷东部陡坡带断裂进行了重新研究，以期深入探讨断裂演化对储层分布的控制作用。从断层组合样式分析入手，利用人工解释投影及断裂空间活动性分析方法相结合探讨边界断层空间展布及活动性特征，结合盆地形成机制，提出彰武断陷盆地断陷期“左旋转换伸展”盆地原型性质，边界断裂（彰武断裂）具有左旋右阶式分段活动的特征，彰武断裂及盆内陡坡带次级断裂控制的盆内次洼中心呈分隔斜列式展布。在上述认识的基础上提出陡坡“转换控砂”储层发育模型，并结合勘探成功实例，建议可在彰武断陷东部陡坡带按照“转换带九佛堂组”和“上升盘义县组”两个层次开展下一步立体勘探工作。

Oil and gas exploration in the Zhangwu Fault Depression has been stagnant for many years, but the success of the Well ZW13 in 2019 has revived hope in the area. On the basis of the existing data and the background of regional tectonic evolution, the faults in the eastern steep slope zone of the Zhangwu Fault Depression have been restudied, which is expected to further explore the control effect of fault evolution on reservoir distribution. Beginning with the fault combination pattern analysis, methods of artificial interpretation projection and fault spatial activity analysis were used to discuss the spatial distribution and activity characteristics of boundary faults. Combining with forming mechanism of basin, the basin prototype property of "Sinistral Rotation transformation-extensional Basin" in the Zhangwu Fault Basin has been put forward. The boundary fault (Zhangwu Fault) is characterized by sinistral rotation right-step type of subsection activities. The center of the subdepression in the basin that controlled by the Zhangwu Fault and the secondary faults in the steep slope zone is separated and diagonally distributed. From the above understanding, a reservoir development model of "transformation sand control" is proposed. Combining with the successful exploration examples, Jiufotang Formation in the transformation and Yixian Formation in the upthrown side in the eastern steep slope zone have been suggested as the main formations for the next three-dimensional exploration project.

https://doi.org/10.3969/j.issn.1008-2336.2021.02.001