Dynamic accumulation process of fault-translocation natural gas accumulation model: A case study on the gas reservoir of the second Member of Upper Triassic Xujiahe Fm in the Xinchang structural zone of the Western Sichuan Depression

被引：0
|
作者：
Zhang S. [1 ]
Tian J. [1 ]
Ye S. [1 ]
Yang Y. [1 ]
Fu J. [1 ]
机构：
[1] Exploration and Development Research Institute, Sinopec Southwest Oil & Gas Company, Chengdu, 610041, Sichuan
来源：
Natural Gas Industry | 2019年 / 39卷 / 07期
关键词：
Fault translocation type; Gas and water distribution law; Hydrocarbon accumulation pattern; Late Triassic; Sichuan Basin; Tight sandstone gas reservoir; Western Sichuan Depression; Xinchang structural zone; Xujiahe Fm;
D O I：
10.3787/j.issn.1000-0976.2019.07.006
中图分类号：
学科分类号：
摘要：
The gas reservoir in the second Member of Upper Triassic Xujiahe Fm (Xu 2 Member) is an important exploration and development block of tight sandstone gas in the Western Sichuan Depression of the Sichuan Basin, but its gas and water distribution relationships are complex and its exploration and development is more difficult. In this paper, the Xu 2 Member gas reservoir in the Xinchang structural zone was taken as an example in order to provide a new idea for efficient exploration of the Xujiahe Fm gas reservoir in the Western Sichuan Depression. The effects of SN striking faults on the hydrocarbon accumulation and gas and water distribution in the Xu 2 Member gas reservoir were discussed based on the chemical characteristics of formation water, combined with the analysis on structures, fault translocation system characteristics and single-well production performance. And the following research results were obtained. First, high yield and enrichment area of Xu 2 Member gas reservoir in the Xinchang structural zone mainly presents a hydrocarbon accumulation pattern of fault-translocation type, which is good in structure-fault-reservoir configuration conditions and gas bearing property. Second, as for the hydrocarbon accumulation pattern of fault-translocation type, the factors controlling the high yield and enrichment of gas reservoir are "high positions of ancient and modern structures + fault translocation by connecting with the source + gas accumulation in high-quality reservoirs", and the key to control gas and water distribution is the spatial and temporal configuration of structure-fault-reservoir. Third, based on the difference of spatial and temporal configuration of structure-fault-fluid-diagenesis-accumulation, combined with single well production data, the hydrocarbon accumulation pattern of fault-translocation type is divided into 3 gas and water production characteristics, i.e., "high and stable gas production, gas and water production simultaneously", "medium and stable gas production, low water production" and "low gas production and high water production". Fourth, the wells with the production characteristics of "high and stable gas production, gas and water production simultaneous" present the characteristic that "faults and reservoirs are connected at structural highs", while the those with the production characteristics of "medium and stable gas production, low water production" present the characteristic that "faults and reservoirs are connected at structural highs and lows", which means that this kind of single well dominantly produces gas at a stable production rate with a little low-salinity formation water. Therefore, single well production can be improved by applying horizontal well drilling, so as to realize better economic benefits. © 2019, Natural Gas Industry Journal Agency. All right reserved.
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页码：49 / 56
页数：7
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