Tectonic evolution in Changshaling transfer zone and its relation with hydrocarbon accumulation
GAO Yang1, ZHANG Wenping2, SUN Xuedong2, ZHOU Zaihua3, ZHANG Baoquan2, BAI Jun2
1. School of Geology Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710064, China; 2. BGP Geological Research Center, Zhuozhou, Hebei 072751, China; 3. Exploration and Development Research Institute, PetroChina Yumen Oilfield Company, Jiuquan, Gansu 735200, China
Abstract：Fault block-lithologic reservoirs in Changshaling transfer zone exhibit complicated fault-formation intersections due to the occurrence of multi-phase tectonic movements,and it is hard to investigate the fault system and hydrocarbon accumulation using seismic data with poor quality.Based on preceding studies,we focus on tectonic evolution history,structure interpretation,episodes of faulting,and trap features to establish the relations among structures,sands,faults,and hydrocarbon migration and accumulation.We conclude that ① Changshaling transfer zone is the product of two-phase extensional tectonic movements in the Early Cretaceous extension and fault depression period.Basement-convolved extensional tectonic movement occurred at the early stage,when west-inclined normal faults came into being.Overburden-slippage extensional tectonic movement occurred at the late stage,when east-inclined plough-type normal faults appeared and intersected early faults; ② early west-inclined syndepositional faults gave rise to fault-bench belts and thus dominate the lateral distribution of sedimentary systems.Accommodation faults gave birth to an ancient land form with fault troughs alternating with fault ridges.Sands migration was dominated by fault troughs,and sands distribution was dominated by the ancient land form at the depositional stage of the Cretaceous Xiagou Formation; ③ early west-inclined faults played a role in hydrocarbon preservation,and late east-inclined faults played a role in hydrocarbon migration.Fault-horst reservoirs are the product of these two-phase faulting activities.In summary,hydrocarbon accumulation is dominated by structures; each fault block has a reservoir; oil and gas concentrate in the structural highs.
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