渤海湾盆地束鹿凹陷西曹固构造带断层圈闭成因机制及定量评价

Genetic mechanism and quantitative evaluation of fault traps in Xicaogu structural belt, Shulu Sag, Bohai Bay Basin

肖瑶 李小冬 郑荣华 刘聪 赵正权

XIAO Yao LI Xiaodong ZHENG Ronghua LIU Cong ZHAO Zhengquan

1. 东北石油大学 地球科学学院, 黑龙江 大庆 163318; 2. 中国石油 华北油田分公司 勘探事业部, 河北 任丘 062552; 3. 中国石油 华北油田分公司 勘探开发研究院, 河北 任丘 062552; 4. 中国石油 华北油田分公司 第五采油厂, 河北 辛集 052360

1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; 2. Exploration Division, PetroChina Huabei Oilfield Branch Company, Renqiu, Hebei 062552, China; 3. Exploration and Development Research Institute, PetroChina Huabei Oilfield Branch Company, Renqiu, Hebei 062552, China; 4. No.5 Oil Production Plant, PetroChina Huabei Oilfield Branch Company, Xinji, Hebei 052360, China

对渤海湾盆地束鹿凹陷西曹固构造带的断层圈闭进行了解剖，该区断层圈闭的主要类型分为同向和反向断层型圈闭，并通过断距的变化特征绘制出断距—距离曲线，恢复了断层的分段生长过程，明确了断层圈闭的成因机制。同向断层圈闭形成在断层分段生长时期的断裂带上盘区域；反向断层圈闭形成于断层成核时期的断裂带下盘区域的分段生长点之间，此部位也是断裂带下盘区域中断距最大的部位。在此基础上，对断层的主要物性参数即断层与地层之间的关系（同、反向断层）、最大断距、断层倾角与走向、地层倾角、断层段长度、旋转角度等的影响进行定量分析，建立了同、反向断层圈闭面积的模式和定量计算方法。应用晋93断圈进行了验证，计算误差值仅为2%左右，说明断层圈闭定量评价方法具有一定的可行性。

The fault traps in the Xicaogu structural belt in the Shulu Sag of the Bohai Bay Basin were studied. They are mainly synthetic fault traps and antithetic fault traps. A displacement-distance curve was drawn according to the variation of displacement. In this way, the segmental growth process of faults was restored, and the genetic mechanism of faults was determined. The synthetic fault traps were developed at the segmental growth point of the hanging wall of the fault. The antithetic fault traps were developed between the segmental growth points of the head wall of the fault during fault nucleation, with the largest displacement in the head wall of the fault. Some parameters such as the correlation between faults and strata (synthetic or antithetic faults), the maximum displacement, fault dip angle and strike, stratigraphic dip angle, fault segment length and formation rotation angle were selected to quantitatively evaluate their controls on fault physical properties. A model and a quantitative calculation method for the area of synthetic and antithetic fault traps were established, and were applied in the Jin 93 fault trap. The calculated error value is only about 2%, which indicates that the quantitative evaluation of fault traps is feasible.

国家自然科学基金项目（41602164）和黑龙江省科学基金项目（QC2016048）联合资助。

https://doi.org/10.11781/sysydz201905762