西湖凹陷保俶斜坡TJT构造中上始新统平湖组深部储层探讨

Discussion of Deep Reservoirs in Pinghu Formation of TJT Structure in Baochu Slope, Xihu Sag

董靓雯 刘闯 沈珊

DONG Jingwen LIU Chuang SHEN Shan

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

西湖凹陷保俶斜坡中南段TJT构造正面临着深部勘探研究方向的选择问题。文章从现有5口井的常规资料中，描述了TJT构造平湖组储层中所呈现的各种成岩现象，分析了TJT构造储层物性特征及垂向变化，从地层水、盐水包裹体资料上探讨了深部次生溶蚀作用的可能性，揭示了斜交式帚状断阶的控相机制以及海平面升降周期对储层分布的影响，进而认为平湖组下部深部储层以岩性成藏为主要方式。

It is difficult to find the deep exploration direction in the TJT structure area of the middle-south area of Baochu slope, Xihu Sag. This article describes various diagenetic phenomena in Pinghu Formation reservoir of the TJT structure from the conventional data of 5 existing wells, and analyzes the physical characteristics and vertical changes of the TJT structure reservoir. According to the data of formation water and salt water inclusions, this paper also discusses the possibility of deep secondary dissolution. Besides, The controlling facies machnism of oblique broom shaped fault terraces and the influence of eustatic cycle on the distribution of the reservoir are discovered, and then it is considered that the deep reservoirs in the lower Pinghu Formation are mainly lithologically formed.

https://doi.org/10.3969/j.issn.1008-2336.2021.02.028