Current in-situ stress field and its controlling factors of the Bozhong 19–6 structure in the offshore Bohai Bay Basin, Eastern China

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-05-27 DOI:10.1016/j.gete.2025.100688

Liang Zhou , Chao Deng , Xin Zhang , Shuguang Xiao , Kai Ji , Changyu Fan , Xiaofang Yang

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Abstract

This study established a comprehensive geomechanical model using the latest exploration well data to evaluate the present-day in-situ stress field of the Bozhong 19–6 (BZ19–6) structure, located in the offshore Bohai Bay basin of Eastern China. Interpretation of drilling-induced tensile fracture strikes and borehole breakout azimuths from borehole imaging logging indicates that the direction of maximum horizontal stress (SH_max) is oriented from NE to sub-EW (45°–110°). By establishing a mud weight–pore pressure (P_p) conversion model, the calibrated mud weight serves as a proxy for P_p. Constraints from formation leak-off tests were applied with Huang's model and the poroelastic strain model to quantify the minimum (SH_min) and SH_max components, which vary continuously with burial depth. Vertical stress (SV) is determined by integrating density logs. The relative magnitudes of the three stress components suggest a transitional stress regime between normal and strike-slip faulting (SH_min < SH_max ≈ SV), where SV and SH_max are comparable in magnitude. Analysis of factors influencing stress magnitude—including burial depth, Young's modulus, and P_p—reveals a strong linear correlation with horizontal stress magnitude. A coupling relationship exists between P_p and SH_min, with a coupling ratio of 0.66. A wellbore trajectory model was employed to calculate parameters for the optimal well trajectory direction and analyze wellbore stability. Fault reactivation potential in the reservoir was evaluated using stress polygons derived from friction limit theory, indicating a low likelihood of fault reactivation due to P_p increases from hydraulic fracturing. This research enhances understanding of the present-day in-situ stress field, which is critical for applications in drilling design, wellbore stability analysis, and fault reactivation potential assessment. Such insights are particularly significant for hydrocarbon reservoir exploration and development.

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渤海湾盆地渤中19-6构造现今地应力场及其控制因素

利用最新探井资料，建立了渤海湾盆地渤中19-6 （BZ19-6）构造现今地应力场的综合地质力学模型。钻孔成像测井对钻井诱发张性裂缝走向和裂缝破裂方位角的解释表明，最大水平应力（SHmax）方向为东北向-亚东西向（45°-110°）。通过建立泥浆比重-孔隙压力（Pp）转换模型，标定后的泥浆比重可作为Pp的代表。利用地层泄漏试验的约束条件，结合Huang的模型和孔隙弹性应变模型，量化了随埋深连续变化的最小（SHmin）和最大（SHmax）分量。垂直应力（SV）由密度测井积分确定。三种应力分量的相对大小表明了正断层和走滑断层之间的过渡应力状态(SHmin <；SHmax≈SV)，其中SV和SHmax的量级相当。对影响应力大小的因素（包括埋深、杨氏模量和pp）的分析显示，应力大小与水平应力大小有很强的线性相关性。Pp与SHmin之间存在耦合关系，耦合比为0.66。采用井眼轨迹模型计算最佳井眼轨迹方向参数，分析井眼稳定性。利用基于摩擦极限理论的应力多边形对储层断层再激活潜力进行了评估，表明水力压裂导致Pp增加导致断层再激活的可能性很低。该研究增强了对当前地应力场的理解，这对于钻井设计、井筒稳定性分析和断层再激活潜力评估的应用至关重要。这些见解对于油气勘探和开发尤其重要。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.