Reservoir Characteristics and Hydrocarbon Accumulation Model in Chunguang Oilfield, Junggar Basin

摘要/Abstract

摘要： Chunguang oilfield is a multi-layer oil-bearing, multi-reservoir type, light oil and heavy oil co-existing complex oil-gas accumulation area. In order to determine the reservoir characteristics and hydrocarbon accumulation model in Chunguang oilfield, the paper analyzes the reservoir-forming factors and typical reservoirs. Double sag hydrocarbon supply, multiple reservoir-cap combinations, multiple reservoir sand bodies and compound transport system are the necessary conditions for the multi-layer oil-bearing and three-dimensional reservoir-forming of Chunguang oilfield, and the peripheral areas of stratigraphic overlap line, denudation line and sandbody pinchout line are favorable areas for oil and gas accumulation. Gypsum-salt-bearing regional caprock and high-porosity and high-permeability reservoirs are the key factors for high oil production of Shawan formation in Chunguang oilfield, biodegradation is the main reason for the thickening of Cretaceous crude oil and the distributions of light oil and heavy oil are mainly controlled by preservation conditions. The hydrocarbon accumulation model can be summarized as follows: double sag hydrocarbon supply, two-stage charging, compound transportation, three-dimensional reservoir forming and crude oil biodegradation and thickening, and the favorable areas are presented, which can provide references for the oil and gas exploration of the western uplift and its surrounding areas in Junggar basin.

关键词: Junggar basin, Chunguang oilfield, reservoir characteristic, reservoir-forming factor, hydrocarbon accumulation model, double sag hydrocarbon supply, compound transportation

Abstract: Chunguang oilfield is a multi-layer oil-bearing, multi-reservoir type, light oil and heavy oil co-existing complex oil-gas accumulation area. In order to determine the reservoir characteristics and hydrocarbon accumulation model in Chunguang oilfield, the paper analyzes the reservoir-forming factors and typical reservoirs. Double sag hydrocarbon supply, multiple reservoir-cap combinations, multiple reservoir sand bodies and compound transport system are the necessary conditions for the multi-layer oil-bearing and three-dimensional reservoir-forming of Chunguang oilfield, and the peripheral areas of stratigraphic overlap line, denudation line and sandbody pinchout line are favorable areas for oil and gas accumulation. Gypsum-salt-bearing regional caprock and high-porosity and high-permeability reservoirs are the key factors for high oil production of Shawan formation in Chunguang oilfield, biodegradation is the main reason for the thickening of Cretaceous crude oil and the distributions of light oil and heavy oil are mainly controlled by preservation conditions. The hydrocarbon accumulation model can be summarized as follows: double sag hydrocarbon supply, two-stage charging, compound transportation, three-dimensional reservoir forming and crude oil biodegradation and thickening, and the favorable areas are presented, which can provide references for the oil and gas exploration of the western uplift and its surrounding areas in Junggar basin.

Key words: Junggar basin, Chunguang oilfield, reservoir characteristic, reservoir-forming factor, hydrocarbon accumulation model, double sag hydrocarbon supply, compound transportation

ZHANG Hui, YUE Xinxin, ZHU Yan, LI Yanran, GUO Juncan, YU Mengli, CHEN Feng. Reservoir Characteristics and Hydrocarbon Accumulation Model in Chunguang Oilfield, Junggar Basin[J]. 新疆石油地质, 2020, 41(zk(English)): 61-66.

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