库车坳陷深层裂缝性储层现今地应力特征及其对天然气勘探开发的指导意义
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徐珂(1991—),男,新疆库尔勒人,高级工程师,博士,从事构造地质学与地质力学方面的研究。E-mail:xuke-tlm@petrochina.com.cn。

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国家科技重大专项“库车坳陷深层-超深层天然气田开发示范工程”(2016ZX05051),中国石油天然气股份有限公司科技重大专项“库车坳陷深层-超深层天然气田开发关键技术研究与应用”(2018E-1803),中国博士后科学基金“博孜-大北区带地质力学对构造和储层影响机理研究”(2019M660269)。


Current in-situ stress characteristics of deep fractured reservoirs in Kuqa Depression and its guiding significance to natural gas exploration and development
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    摘要:

    为了明确深层复杂背景条件下储层现今地应力的分布特征,基于库车坳陷克拉苏构造带大北12气藏,开展现今地应力研究,探讨地应力非均质分布机理,并据此提出支持井位部署的相关建议。研究结果表明:克拉苏构造带埋深超过4 500 m的储层为走滑型地应力机制,大北12气藏最大水平主应力为125~160 MPa,最小水平主应力为118~130 MPa,地应力非均质性强且井间差异大。复杂的地质边界条件和储层的互层岩性造成地应力分布具有极强的非均质性,地应力有利区和不利区交替分布,在构造高部位也可能钻遇地应力不利区,不能简单地采用“沿长轴、占高点”的方案部署井位。定向井具有有利区穿越广、裂缝钻遇率高、井眼轨迹安全稳定及避障避险的多重优势,是复杂地质背景条件下的优势井型,建议沿地应力低、裂缝发育且井壁稳定的方向设计井眼轨迹,并根据地应力状态选择合理的储层改造方式。

    Abstract:

    The research on the in-situ stress of Dabei12 gas reservoir in Kelasu structural belt of Kuqa Depression was carried out to clarify the distribution of in-situ stress in deep reservoirs and explore the heterogeneous distribution mechanism of the in-situ stress. In addition,suggestions were put forward for well placement against a complex geological background.The results demonstrate that the reservoir at more than 4 500 m in Kelasu structural belt follows a strike-slip in-situ stress mechanism. The maximum horizontal principal stress in Dabei12 gas reservoir ranges from 125 to 160 MPa,and the minimum horizontal principal stress is 118-130 MPa. The in-situ stress shows strong heterogeneity and the difference between wells is evident. Complex geological boundary conditions and interbedded lithology of the reservoir lead to the extremely heterogeneous in-situ stress distribution. Favorable and unfavorable areas of in-situ stress are alternately distributed,and the unfavorable area may also be drilled in the structural high. Therefore,the plan of“occupying the high point along the long axis”cannot be simply implemented for well placement. Moreover,a directional well crosses a wide favorable area,with a high probability of penetration of fractures as well as a safe and stable well trajectory,and it can avoid obstacles and risks. Accordingly,it is a preferable well type against a complex geological background. It is suggested that the well trajectory should be designed in the direction with low stress,well-developed fracture,and high borehole wall stability,and a reasonable reservoir simulation mode should be selected according to in-situ stress.

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徐珂,张辉,刘新宇,王志民,来姝君.库车坳陷深层裂缝性储层现今地应力特征及其对天然气勘探开发的指导意义[J].油气地质与采收率,2022,29(2):34~45

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  • 在线发布日期: 2022-06-21
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《油气地质与采收率》
《油气地质与采收率》入选北大《中文核心期刊要目总览》2020年版