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The Gas Reservoir-forming Conditions and Accumulation Models of Subtle Traps in Upper Triassic in Central Sichuan Basin

Author: JiangJunWei
Tutor: ZhangShiHong；LiWei
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: Sichuan The Upper Triassic Oil and gas reservoirs Main controlling factors Accumulation model
CLC: P618.13
Type: Master's thesis
Year: 2006
Downloads: 256
Quote: 2
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Abstract


Sichuan region of the Upper Triassic Xiangxi gas exploration prospects, after about five years of exploration and research has yielded fruitful results, but oil and gas formation conditions of the region and the main controlling factors still need further study. In this study, the drilling coring analysis data, the underground testing data, seismic data based, comprehensive utilization of sedimentology, sequence stratigraphy, petroleum geology, geophysics, organic geochemistry multidisciplinary theories and research methods, Sichuan Xiangxi Qun, storage, cover and other petroleum geological conditions and anatomy from the oil and gas reservoir and hydrocarbon accumulation of two aspects were analyzed in Sichuan main controlling factors of hydrocarbon accumulation, the aim is to provide the basis for the next phase of the oil and gas exploration . Main understanding and results are as follows: 1, Sichuan Xiangxi group of hydrocarbon source rocks are mainly distributed in the incense three sections and Hong five segments, which is characterized by a wide distribution, thickness, hydrocarbon potential, oil-source correlation indicates that Xiangxi gas of spontaneous storage of coal-type gas. 2, the Sichuan region of Xiangxi Group sandstone reservoir thickness, widely distributed, low porosity and low permeability, strong heterogeneity, effective reservoir thin, 2-10 meters. Comprehensive analysis of that Hong Sec reservoir is mainly distributed in the of northern Sichuan Middle East Camp Hill - Nanchong area and in central and southern Sichuan Anyue - then South area; Hong Sec mainly distributed in the northwest of Sichuan Tyurin - 1.80 Course - the Jinhua area and in central and southern Sichuan the Anyue - Penglai - Moxi area. 3, the gas reservoirs of gas reservoir anatomy shows, in Sichuan gas reservoir in good preservation conditions, raw reservoir cover to match each other, the gas reservoir lithology or structural - lithologic gas reservoir, with the formation of large and medium-sized natural gas reservoir conditions. Of Xiangxi Group of Sichuan natural gas geological conditions and gas reservoir anatomical comprehensive analysis that there are five aspects of the main controlling factors in the middle areas of Xiangxi Group of gas accumulation, a hydrocarbon source rock condition is good or bad control the abundance of reserves of gas reservoirs degrees; Second, the development of faulting and fracturing not only control the oil and gas migration and accumulation and redistribution, but more important is to control oil and gas production capacity characteristics;, inheritance and development of the ancient structure is favorable for hydrocarbon accumulation zone;, the main water systems high-energy river, relatively good physical properties, is an important factor controlling hydrocarbon accumulation; the formation fluid obvious potential difference, the favorable western sag generated a large number of natural gas eastward migration and accumulation. The paper presents two gas accumulation mode: First, the Sichuan ramp with gas accumulation accumulation model, eastern Sichuan fold belt of natural gas migration and accumulation mode. 6, central and southern regions of Sichuan is the focus of exploration zones.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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