克拉苏构造带博孜1气藏现今地应力场和高效开发

doi:10.7657/XJPG20210612

摘要/Abstract

摘要：

为提高塔里木盆地库车坳陷克拉苏构造带博孜1气藏开发效果,通过多信息和多方法融合,利用测井解释和三维数值模拟,查明了现今地应力场空间分布特征,明确了其影响因素,并为开发井部署提供了依据。博孜1气藏埋深超过6 500 m处仍为走滑型应力场,现今地应力高,水平应力差大,且非均质性强,现今最大水平主应力方向在平面和纵向上会发生偏转,最大可偏转90.0°。复杂地质边界条件和岩石力学性质差异,是造成地应力场分布非均质性强的重要原因,气藏开发对井眼周围地应力状态扰动明显。超深储集层的井位部署需要考虑现今地应力和邻井开发状态引起的扰动,宜采用大斜度井,尽可能多钻遇有利区带,以降低储集层强非均质性在钻井安全方面带来的风险。

关键词: 塔里木盆地, 库车坳陷, 克拉苏构造带, 博孜1气藏, 超深储集层, 非均质性, 地应力场, 大斜度井

Abstract:

In order to improve the development effect of the Bozi-1 gas reservoir in the Kelasu structural belt in the Kuqa depression, Tarim basin, multiple information and methods were used, and logging interpretation and three-dimensional numerical simulation were carried out to study the current spatial distribution and its influencing factors of the in-situ stress field. The findings are basic data for locating development wells. The Bozi-1 gas reservoir is deeper than 6 500 m and still in a strike-slip in-situ stress field. Current in-situ stress is high, the horizontal stress difference is large and the heterogeneity is strong. The current maximum horizontal principal stress may deflect horizontally and longitudinally, with a maximum deflection of 90°. Complicated geological boundary conditions and differences in rock mechanical properties are important factors on the strong heterogeneity of the in-situ stress field. The development of the gas reservoirs obviously disturbs the in-situ stress state around wellbores. To locate wells in the ultra-deep reservoirs, it is necessary to consider the current in-situ stress and the disturbance caused by adjacent wells. It is suggested to drill highly-deviated wells and expand reservoir contact to eliminate the risk of the strong reservoir heterogeneity on drilling safety.

Key words: Tarim basin, Kuqa depression, Kelasu structural belt, Bozi-1 gas reservoir, ultra-deep reservoir, heterogeneity, in-situ stress field, highly-deviated well

中图分类号:

TE332
P551

徐珂, 杨海军, 张辉, 王海应, 袁芳, 王朝辉, 李超. 克拉苏构造带博孜1气藏现今地应力场和高效开发[J]. 新疆石油地质, 2021, 42(6): 726-734.

XU Ke, YANG Haijun, ZHANG Hui, WANG Haiying, YUAN Fang, WANG Zhaohui, LI Chao. Current In-Situ Stress Field and Efficient Development of Bozi-1 Gas Reservoir in Kelasu Structural Belt[J]. Xinjiang Petroleum Geology, 2021, 42(6): 726-734.

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