地球化学动态示踪油气成藏过程初探——以库车坳陷大宛齐构造为例

doi:10.11743/ogg20050603

Abstract

Abstract:

In Dawanqi oil/gas pool in Kuqa depression,Tarim basin,the enrichment of ³⁸Ar was related to the migration of anoxic fluids and volatile constituents along large faults.Tuzimazha fault is the major pathway,through which ³⁸Ar generated from fluid activities would have migrated to the oil and gas reservoirs.The low concentration of ³⁸Ar in Dabei reservoir reveals that gas would have been reservoired near the source rocks.Dawanqi oil/gas field is not an oil/gas pool as a result of later gas invasion,but is a primary oil/gas pool.The light components of gas partially dispersed along the fault due to the poor sealing ability of the trap at later reservoiring stage,leading to the formation of the current condensate gas reservoir with relatively low saturation.Hydrocarbons were generated from the Triassic and Jurassic major source rocks below,and were accumulated in the reservoir rocks above,i.e.,hydrocarbons have been generated from the organic matters in the Mesozoic fresh lake facies sediments during mature to high-mature evolutional phases.During the reseroviring process of Dawanqi oil/gas pool,hydrocarbons first migrated upward along Tuzimazha fault,and then entered Dawanqi structure from north to south.Dawanqi oil/gas pool has experienced early and late charging processes.The high-mature to over-mature natural gas charged in later stage would have mainly accumulated in the upper part,due to their relatively low density;while the relatively high density natural gas generated in early stage would have accumulated in the lower part.

Key words: isotopic composition, reservoiring process, geochemical tracing, Kuqa depression, Tarim basin

CLC Number:

TE112.3

Liu Wenhui, Zhang Dianwei, Zheng Jianjing, Chen Mengjin, Wang Xiaofeng, Gao Bo. A preliminary discussion on geochemical dynamic tracing of oil/gas reservoiring process—taking Dawanqi structure in Kuqa depression as an example[J]. Oil & Gas Geology, 2005, 26(6): 717-723,729.

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A preliminary discussion on geochemical dynamic tracing of oil/gas reservoiring process—taking Dawanqi structure in Kuqa depression as an example

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