克深气田储层地质力学特征及其对开发的影响

doi:10.11885/j.issn.1674-5086.2020.04.09.01

摘要/Abstract

摘要： 克拉苏构造带深层裂缝型致密砂岩气藏经历强挤压构造变形，复杂的现今地应力场和天然裂缝系统导致储层非均质性和各向异性较强，不同构造之间和同一构造不同位置的气井产能差异明显。为明确影响该区天然气开发中的地质主控因素，在井筒一维地质力学参数评价和构造格架搭建的基础上开展了克深气田储层地质力学建模，深入分析克深气田多个构造带储层岩石力学性质、现今地应力场及天然裂缝的发育特征，归纳总结不同构造带、同一构造带不同部位及不同层位的储层地质力学特征，并结合克深气田典型井的开发现状，建立地质力学特征与产能的关联，最后，针对不同类型的气藏分别提出与之匹配的布井原则。研究表明：（1）不同构造类型气藏地应力场分布特征差异较大，应力方位与天然裂缝产状之间的关系也有明显不同；（2）气藏内储层地质力学属性呈现自分层特征，其直接影响储层孔隙度和渗透率分布；（3）气藏内部处于应力低值、裂缝走向与水平主应力方位之间夹角小的位置，储层渗透性能较好，单井产能更高。研究不仅为储层评价和气藏描述提供了有力的补充，同时也为井位优化提供有利的依据。

关键词: 克深气田, 裂缝性砂岩, 储层地质力学, 现今地应力, 天然裂缝, 产能

Abstract: The fractured sandstone reservoir has experienced strong compression structure deformation in deep zone of Kelasu tectonic zone. Complex current in-situ stress field and natural fracture system lead to strong heterogeneity and anisotropy of reservoir. There were obvious differences in gas well productivity between different structures and at different locations of the same structure. In order to clarify the main controlling geological factors affecting the development of natural gas in this area, the research on reservoir geomechanical modeling of Keshen Gas Field was carried out based on the evaluation of 1 D geomechanical parameters and the construction of structural framework. The rock mechanics properties, present in-situ stress field and development characteristics of natural fractures of reservoirs in several structural belts of Keshen Gas Field are analyzed in depth. The geomechanical characteristics of reservoirs in different structural belts, different parts of the same structural belt and different horizons are summarized respectively. Combining with the development status of typical wells in Keshen Gas Field, the relationship between geomechanical characteristics and productivity is established. Finally, the matching well distribution principles are proposed for different types of gas reservoirs. It is shown that: (1) the distribution characteristics of in-situ stress field in different structural types of gas reservoirs are quite different, and the relationship between stress orientation and natural fracture occurrence is also distinctly different; (2) geomechanical properties of reservoirs in gas reservoirs show selfstratification characteristics, which directly affect the distribution of reservoir porosity and permeability; and (3) gas reservoirs are located in low stress value, small angle between fracture strike and horizontal principal stress orientation, good permeability and higher productivity of single well. The research not only provides a useful supplement for reservoir evaluation and gas reservoir description, but also promotes well location optimization of development plan.

Key words: Keshen Gas Field, fractured sandstone, reservoir geomechanics, current in-situ stress, natural fractures, productivity

中图分类号:

TE122

江同文, 张辉, 徐珂, 王志民, 王海应. 克深气田储层地质力学特征及其对开发的影响[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 1-12.

JIANG Tongwen, ZHANG Hui, XU Ke, WANG Zhimin, WANG Haiying. Reservoir Geomechanical Characteristics and the Influence on Development in Keshen Gas Field[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 1-12.

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