Characteristics of fault activity and its effect on na-tural gas accumulation in Changling fault depression
WANG Qi1,2, ZHANG Wanfu3, SUN Yonghe2,4, WANG Yougong1,2,5, FU Xiaofei1,2, SUN Lizhi3
1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; 2. Heilongjiang Key Laboratory for Integrity Eva-luation of Oil and Gas Reservoir and Underground Storage, Daqing, Heilongjiang 163318, China; 3. Geological Research Center, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 4. School of Petroleum and Natural Gas Enginee-ring, Chongqing University of Science and Techno-logy, Chongqing 401331, China; 5. Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya, Hainan 572025, China
Abstract:There are various types of gas reservoirs in the Changling fault depression of Songliao basin, and their distribution characteristics are closely related to fault activity. Therefore, against the tectonic evolution background of the basin, the expansion index(EI) of the extensional normal fault, throw-depth (T-Z) curve of the normal fault, inversion rate (RI) of the reverse fault, and the slip-distance curve are used to analyze the fault activity period and intensity for further classification of fault types and the analysis of the different control effects of different faults on gas accumulation. The results reveal that ①the Changling fault depression has developed four types of fault systems: the faults active in the rifting period, the faults active during the rifting-depression period, long-term (continuous activity from the rifting-depression period to the inversion period, the same below) active weak reverse faults, and long-term active strong reverse faults. ②Faults formed during the rifting period control the source rock of the Shahezi Formation and the volcanic reservoirs of the Yingcheng Formation. ③Faults active in the rifting-depression period not only control the distribution of source rock and volcanic reservoirs but also serve as oil and gas transport faults of the middle and lower gas reservoir combinations when they are in the source. ④Long-term active weak reverse faults control the distribution of source rock during the rifting period, act as transport faults during the depression period, and control shallow traps and adjust the gas reservoirs in the inversion period. ⑤Long-term active strong reverse faults can destroy the natural gas reservoirs formed in the depression period, and thus it is difficult to form large-scale natural gas accumulation around such faults. The above conclusions can be used as a reference to guide nature gas exploration in the southern Songliao Basin.
王琦, 张万福, 孙永河, 王有功, 付晓飞, 孙立志. 长岭断陷断层活动特征及控藏作用[J]. 石油地球物理勘探, 2022, 57(5): 1182-1191.
WANG Qi, ZHANG Wanfu, SUN Yonghe, WANG Yougong, FU Xiaofei, SUN Lizhi. Characteristics of fault activity and its effect on na-tural gas accumulation in Changling fault depression. Oil Geophysical Prospecting, 2022, 57(5): 1182-1191.
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