The internal structure of Liaozhong No.1 strike slip fault and its control on hydrocarbon accumulation: a case study of Jinzhou A Structure
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摘要:
锦州A构造的发现是辽东湾海域走滑断裂带内调节断层欠发育区的首个勘探突破，为弄清该构造成藏的主控因素，利用钻井、测井、地震等资料，对锦州A 构造段辽中1号走滑断层及其内部结构开展研究，并明确其对油气成藏的控制作用。研究结果表明：地震振幅、纵波速度在走滑断层附近发生明显变化，这种变化的范围可以代表走滑断层内部结构发育的规模，从浅到深辽中1号走滑断层内部结构的发育规模变大。利用多井横向对比常规测井的密度、中子孔隙度和声波时差资料以及偶极声波远探测技术，可以识别走滑断层内部结构，随着距离走滑断层的接近, 密度资料会出现先减小再增大的趋势，中子孔隙度和声波时差资料则会出现先增大再减小的趋势，代表从围岩到断层破碎带再到断层核的发育趋势。锦州A 构造段辽中1号走滑断层发育由断层破碎带和断层核组成的二元结构，断层破碎带孔渗性好，是油气垂向运移的有利通道；断层核孔渗性差，有利于油气的侧向封堵。
Abstract:The discovery of Jinzhou A Structure (JAS) in the Liaodong Bay, NE China, marks a breakthrough of oil-gas exploration in less-developed area of accommodated fault in the Liaozhong No.1 strike-slip fault (No.1 SSF) zone. To determine the main controlling factors of hydrocarbon accumulation in the JAS, based on drilling, logging, and seismic data, the No.1 SSF and its internal structure were anatomized in the JAS, and its controlling effect on hydrocarbon accumulation was clarified. Results show that first, the amplitude and P-wave velocity changed obviously near No.1 SSF. The range of these changes showed that the internal structure and the scale of the No.1 SSF increased from shallow to deep. Secondly, the internal structure of the No.1 SSF was revealed by using multi-well lateral comparison in bulk density (as in ZDEN), neutron porosity (as in CNCF), and delta compression time (as in DT) data, and by using dipole acoustic reflection imaging technology. Approaching to the No.1 SSF, the ZDEN data decreased first and then increased, while the CNCF and DT data showed the opposite trend, indicating the transition from surrounding rock to fault fracture zone and then to the fault core. Thirdly, the JAS in the No.1 SSF developed a dual structure composed of fault fracture zone and fault core. The fracture zone has good porosity and permeability, which is a favorable channel for vertical migration of oil and gas, while the fault core has poor porosity and permeability, which is conducive to lateral sealing of oil and gas.
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