Mechanism of Geological Activities of Eastern Tarim Basin Hydrothermal Fluids and Its Significance in Reservoir Transformation

doi:10.11885/j.issn.1674-5086.2017.02.09.02

Abstract

Abstract: Faults developed in the Eastern Tarim Basin. Early and late faults underwent processes such as mutual transformation, superposition, and recombination, and deep faults run through multiple strata. Compresso-crushed zones and fracture zones that were formed during fault activities function as the ascending passage for magmatic hydrothermal fluids and provide favorable conditions for reservoir reconstruction by hydrothermal dissolution. As such, identifying the hydrothermal activity stage is crucial for understanding of the mechanism of dolomite reservoir formation in the Eastern Tarim Basin. By observing, identifying, and analyzing drilling cores and fragments, rock thin sections, and casted rock thin sections, albitization and featherlike authigenic illite precipitation were identified and discovered in the Lower Paleozoic carbonate rocks for the first time in the Tarim Basin. By studying geochemical properties such as the homogenization temperature, and oxygen and carbon isotopes of the inclusions, the source of the diagenetic fluids was found to be magmatic hydrothermal fluids. This finding supplements the mineralogical indications of hydrothermal activities in the region. The study further identified the existence of stage-three hydrothermal activity, and by investigating its mechanism and significance in the reservoir space, it was concluded that stage-one hydrothermal activity does not play a key role in reservoir formation. Stage-two hydrothermal activity is mainly developed in constrained sedimentation environments. Stage-three hydrothermal dissolution forms dissolution fissures and cavities that are favorable for the migration and accumulation of natural gas, and therefore, the fissures and cavities serve as the main seepage passage for natural gas accumulation and reservoir formation in the region.

Key words: Eastern Tarim Basin, dolomite, fracture, hydrothermal activities, reservoir transformation

CLC Number:

TE122

YAN Bo. Mechanism of Geological Activities of Eastern Tarim Basin Hydrothermal Fluids and Its Significance in Reservoir Transformation[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 17-28.

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