渤海海域断裂组合样式与幔源CO_2分布的关系

Relationship between fault combination styles and mantle source CO_2 distribution in Bohai area

应用钻井、三维地震等资料,对渤海海域断裂组合样式进行详细划分,并在此基础上分析CO_2气(藏)分布与断裂组合样式间的关系。研究表明,渤海地区存在4大类断裂组合样式:伸展断裂及其组合样式、走滑断裂及其组合样式、反转构造及其组合样式和伸展-走滑复合组合样式。其中具有Y字形似花状构造的断裂CO_2气聚集的风险性最高,负花状构造及铲式断层风险次之,反转构造风险性最低。结合莫霍面特征可知,在莫霍面上拱区的具有Y字形似花状构造区域是CO_2聚集的高风险区。

Based on the drilling and 3 D seismic data,a detailed study of the fault combination styles in the Bohai area is undertaken,and the rules of the distribution of the CO_2 gas reservoir and the fault combination styles are analyzed. The results show that there are four major types of fault assemblages in Bohai area,i. e. extensional faults and their combination styles,strike-slip faults and their combination styles,inversion structures and their combination styles,and extensional and strike-slip combination styles. The fault with Y-shape semi-flower structure has the highest risk for CO_2 accumulation,whereas negative flower structure and listric fault have lower risk,and inversion structure has the lowest risk. Integrating the features of Moho,the region with Y shape semi-flower struc-ture over the Moho uplift is the high risk area for CO_2 accumulation.