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Geochemical Characteristics and Migration Pathways of Ordovician Carbonate Oil Reservoirs in the Tuoputai Area, Tarim Basin, Northwestern China
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2021-05-31 , DOI: 10.1111/1755-6724.14730
Hua LIU 1, 2, 3 , Shen WANG 1, 2 , Bin CHENG 1, 2 , Zicheng CAO 4 , Ziyue JIANG 1, 2
Affiliation  

Exploration potential is huge and the oil resources are rich in the Ordovician reservoirs of the Tarim Basin. However, the mechanism of hydrocarbon accumulation is complex and not yet fully understood. In the Tuoputai area, the hydrocarbon migration pathways and characteristics of deep hydrocarbon accumulation are revealed through analyses of the physical data of rich oil and gas, the geochemical parameters of oil, and fluid inclusions. The results show that the Ordovician oils in the Tuoputai area have the same geochemical characteristics as the mixed oil from the Lower Cambrian source rock and the Middle–Upper Ordovician source rock. The Ordovician reservoirs have been charged three times: in the late Caledonian, late Hercynian, and Himalayan stages. Oil charging occurred in the Hercynian stage, in particular, as it is the main filling period of hydrocarbon. The north–northeast (NNE)-trending TP12CX major fault, active in in these times and is dominant migration channel of hydrocarbon, but there is segmentation affected by the difference of activities. Oil maturity is higher in the south than in the north and is abnormally high near the major fault. Parameters related to migration indicate that oil migrated northeastward along the NNE-trending TP12CX major fault and adjusted laterally along the secondary faults and weathering crust, forming the present characteristics of oil and gas distribution.

中文翻译:

塔里木盆地托普台地区奥陶系碳酸盐岩油藏地球化学特征及运移途径

塔里木盆地奥陶系油气勘探潜力巨大,石油资源丰富。然而,油气成藏机制复杂且尚未完全了解。托普台地区通过对富油气物理资料、石油地球化学参数和流体包裹体的分析,揭示了油气运移途径和深层油气成藏特征。结果表明,托普台地区奥陶系石油与下寒武统烃源岩和中上奥陶统烃源岩混合油具有相同的地球化学特征。奥陶纪水库已充电三次:加里东晚期、海西晚期和喜马拉雅阶段。充油发生在海西期,特别是 是烃类的主要充注期。北—东北(NNE)向的TP12CX主断裂,在该时期活动,是油气的主导运移通道,但受活动差异影响存在分段。南部的石油成熟度高于北部,并且在主断层附近异常高。运移相关参数表明,石油沿 NNE 向的 TP12CX 大断裂向东北运移,并沿次要断裂和风化壳横向调整,形成了油气分布的现状特征。南部的石油成熟度高于北部,并且在主断层附近异常高。运移相关参数表明,石油沿 NNE 向的 TP12CX 大断裂向东北运移,并沿次要断裂和风化壳横向调整,形成了油气分布的现状特征。南部的石油成熟度高于北部,并且在主断层附近异常高。运移相关参数表明,石油沿 NNE 向的 TP12CX 大断裂向东北运移,并沿次要断裂和风化壳横向调整,形成了油气分布的现状特征。
更新日期:2021-05-31
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