The Law of Hydrocarbon Accumulation in Carbonate Reservoirs in Halahatang Area, Tarim Basin

doi:10.3969/j.issn.1006-6535.2021.02.006

Abstract

Abstract: The Halahatang area is the main oil-bearing zone in the Tarim Basin. It is difficult to predict the law of hydrocarbon accumulation due to the influence of multi-period tectonic movements. For this reason, based on the interpretation of seismic data, a systematic study was conducted for the fault distribution and paleostructure in hydrocarbon accumulation period of the deep carbonate reservoirs in the Rewapu block in the Halahatang area. As indicated by the analysis results of reservoir distribution and productivity data, the secondary migration of oil and gas was adjusted by branch faults in NE-SW, NW-SE and near SN direction in the study area, and oil and gas were accumulated in the reservoir development termination area at the updip end of the faults; oil and gas migrated along the dominant migration direction, and the reservoirs that have long been located in the nose-shaped uplift area of the paleostructure and the overlapping area of local tectonic high points were conducive to oil and gas preservation. Based on the analysis of faults and paleostructures, combined with the characteristics of the reservoir, a hydrocarbon accumulation model was established with an “X”-shaped strike-slip fault used to channel oil and gas from south to north, and its associated secondary branch faults to adjust the secondary migration of oil and gas along the direction of the dominant oil and gas migration, finally enabling oil and gas to accumulate in reservoir development area located in the uplift area of the paleostructure and the overlapping area of local tectonic high points.

Key words: fault distribution, paleostructure, karst reservoir, accumulation model, Halahatang Area

CLC Number:

TE122.2

Zhu Weiping, Sun Dong, Yao Qingzhou, Fang Qifei, Dai Dongdong. The Law of Hydrocarbon Accumulation in Carbonate Reservoirs in Halahatang Area, Tarim Basin[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 41-48.

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