高分辨率油基泥浆成像测井在储层地质评价中的综合应用

Comprehensive Application of High-resolution Oil-based Mud Image Logging in Reservoir Geological Evaluation

何玉春 张国栋 曲长伟 鲁法伟 秦兰芝 查明

HE Yuchun ZHANG Guodong QU Changwei LU Fawei QIN Lanzhi ZHA Ming

中海石油（中国）有限公司上海分公司，上海　200335 斯伦贝谢中国公司，北京　100015 中国石油大学（华东），山东青岛　200131

Shanghai Branch, CNOOC (China) Limited, Shanghai 200335, China Schlumberger China, Beijing 100015, China China University of Petroleum (East China), Qingdao, Shandong 200131, China

为了精细表征西湖凹陷平湖构造平北区平湖组储层地质特征，首次将高分辨率油基泥浆电成像技术引入岩性岩相识别、沉积环境研究、物源方向分析及构造条件的研究中。结果表明，平湖构造平北区平湖组储层主要发育细砂岩及粉砂岩，共发育四类砂岩岩相及四类泥岩岩相类型。综合岩性岩相及区域地质特征，确定平湖组主要为潮坪及三角洲前缘沉积；基于交错层理明确了平湖组沉积时期物源方向，先期主要为南东向，后期转向南西向。平湖组主要发育张开缝及闭合缝两种裂缝类型，并利用高分辨率成像确定了诱导缝及井壁崩落的方位，实现了对裂缝及现今应力场方向的精细刻画。研究结果为今后平湖构造平北区平湖组甜点优选和井位方案设计提供了强有力的地质依据。

In order to finely characterize the reservoir geological characteristics of Pinghu Formation in Pingbei area of Pinghu tectonic belt in Xihu Sag, the high-resolution oil-based mud electric imaging technology has been utilized on the study of lithology and lithofacies identification, sedimentary environment research, provenance direction analysis and tectonic evaluation for the first time. The results show that the reservoir lithology of Pinghu Formation is dominated by fine sandstone and siltstone. It is determined that four categories of sandstone lithofacies and four types of mudstone lithofacies are mainly developed in Pinghu Formation.Based on lithology, lithofacies and regional geological characteristics, it was determined that Pinghu Formation is mainly composed of tidal flat and delta front deposit. Due to the development of cross bedding, it has been determined that the provenance direction of Pinghu Formation during the depositional period was mainly southeast in the early stage and turned to southwest in the later stage. In Pinghu Formation, there are two fracture types: open fracture and closed fracture. The orientation of induced fracture and borehole caving is determined by high-resolution imaging. And the fine description of fracture and current stress field direction are realized. The research results provide a strong geological basis for pay zone optimization and well location design on Pinghu Formation in Pingbei area of Pinghu tectonic belt in the future.

https://doi.org/10.3969/j.issn.1008-2336.2023.02.057