Structural Deformation and Hydrocarbon Accumulation Characteristics of Baxigai Formation in Awat Area, Kuqa Depression

doi:10.7657/XJPG20240601

Abstract

Abstract:

The structural deformation in the foreland thrust belt of the Kuqa depression mainly occurred during the middle-late Himalayan orogeny. Previous studies primarily identified the initiation timing of shallow postsalt fold deformation, but had no absolute dating constraints on the subsalt thrust deformation and the timing of hydrocarbon accumulation. Taking the Awat area in the Kuqa depression as an example, using the data from petrographic observations, calcite U-Pb dating, and fluid inclusion analysis, the diagenesis, formation timing of calcite veins, and hydrocarbon accumulation process of the Lower Cretaceous Baxigai formation reservoirs were investigated, and the timing of structural deformation and hydrocarbon accumulation in the Awat area was determined. The research results show that two periods of calcite were developed in the Baxigai formation in the Awat area. The early calcite cement formed at (98.0±14.0) Ma, while the late calcite veins formed at (3.7±1.0) Ma, reflecting the time of subsalt thrust deformation. Oil inclusions and gas inclusions of different periods were identified in the calcite veins. Based on the homogenization temperatures of the fluid inclusions, burial history and thermal history, it is inferred that the oil charging occurred at 4.0-3.0 Ma, and gas charging at 3.0-1.0 Ma. The early oil reservoir underwent reworking of gas washing in the late Pliocene, forming the current condensate gas reservoir.

Key words: Tarim basin, Kuqa depression, Awat area, structural deformation, fluid inclusion, hydrocarbon accumulation period, accumulation model

CLC Number:

TE122.14

WANG Yingying, GUI Lili, LU Xuesong, LIU Huichuan, MO Tao, ZHOU Hui, JIANG Lin. Structural Deformation and Hydrocarbon Accumulation Characteristics of Baxigai Formation in Awat Area, Kuqa Depression[J]. Xinjiang Petroleum Geology, 2024, 45(6): 631-641.

Figures/Tables 12

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