西湖凹陷K构造平湖组成藏系统分析

Study on the Hydrocarbon Accumulation System of Pinghu Formation in K Structure of Xihu Sag

刘峰 时新强 张传运 杨鹏程 黄苏卫 张昆

LIU Feng SHI Xinqiang ZHANG Chuanyun YANG Pengcheng HUANG Suwei ZHANG Kun

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院，上海　200120

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

为提高西湖凹陷K构造有利区带预测的准确性，以钻井地质资料及油气层测试结果为基础，结合流体封存箱理论，开展西湖凹陷K构造平湖组成藏系统研究。结果表明：在平中段顶部深水泥岩段的区域性封存箱盖层之下，帚状同生断裂体系进一步分割“泥包砂”地层系统，形成不同级别不同活动周期的断裂体系所控制的次级封存箱。研究区平湖组油气以箱内成藏为主，平中段顶部深水泥岩段作为封存箱顶部盖层对油气纵向分布有重要的控制作用。该研究对K构造勘探目标优选工作有重要指导意义。

Based on the practically drilled geological data and the experimental test results of oil and gas reservoirs, combined with the theory of fluid compartment, this paper studies the hydrocarbon accumulation system of Pinghu Formation in K structure of Xihu Sag to improve the prediction accuracy of favorable zones. The results show that under the regional seal of the deep-water mudstone in the top of the middle section of Pinghu Formation, the broom-like contemporaneous fault system further divided the "mud-coated sand" stratigraphic system, forming secondary seal boxes controlled by the fault system of different levels and different active periods. The oil and gas of K structure were mainly sealed in pressure compartments, and the deep-water mudstone in the top of the middle section of Pinghu Formation controlled the vertical distribution of oil and gas. The result will provide importment guidance for the optimization of oil and gas exploration targets in K structure of Xihu Sag.

https://doi.org/10.3969/j.issn.1008-2336.2023.01.001