川西坳陷雷口坡組氣源及成藏特征
[Abstract]:Several gas reservoirs or gas-bearing structures such as Zhongba Xinchang and Pengzhou have been found in the western Sichuan depression which shows the good oil and gas exploration potential of the Laikoupo formation of the Middle Triassic in this area. Guided by the multi-disciplinary theories of petroleum geology, reservoir geology, tectonic geology, oil and gas geochemistry and modern oil and gas geological reservoir formation theory, this paper adopts the methods of field observation, sampling and laboratory experimental analysis, and the combination of macro and micro. Based on a large amount of analytical data and field geological data, this paper discusses in detail the geochemical characteristics of the source of natural gas and related source rocks of the Leikoupo formation, and on the basis of the analysis of typical gas reservoirs, The main controlling factors of natural gas accumulation are summarized. The main conclusions are as follows: (1) the reservoir of Leikoupo formation is dominated by granular dolomite, and the reservoir space is mainly composed of intergranular and intergranular dissolved pores, sedimentary facies and diagenesis. Due to weathering and erosion and tectonic movement, the high quality reservoirs are mainly distributed in the third and fourth member of Lei. (2) the gas in the target zone is mixed source. Among them, the natural gas of the third member of Zhongba Lei is mainly the mixed source gas of the lower Permian oil type gas and the coal type gas of the Shangfu Xujiahe formation, and the Permian oil type gas is the main one. The geochemistry characteristics of Xinchang and Guankou 003-5 and Zhongba third member are obviously different, so it is considered to be the natural gas generated by the source rock of Leikoupo formation itself. The characteristics of natural gas in well Pengzhou 1 are similar to those in the third member of Zhongba Lei formation, which is a supplement to the mixed source gas between Xujiahe and Permian. (3) it is found through gas source comparison that the mixed source gas of Xujiahe and Permian may exist in the Laikoupo formation itself. The hydrocarbon source rocks related to the reservoir formation of the Leikoupo formation mainly include the Upper Triassic Xujiahe formation, the Leikupo formation own source rock, and the underlying Permian source rock. The Carbonate source rocks of Leikoupo formation have hydrocarbon generating capacity only in local areas, which can be used as a supplement of gas source. The Xujiahe formation and the Upper Permian are a set of high quality hydrocarbon source rocks, which are the main natural gas sources of the gas reservoirs of the Leikoupo formation. (4) the main controlling factors of the composition of the Laikoupo reservoir are the development of the hydrocarbon source faults and unconformities. Under the communication of fault and unconformity surface, the oil and gas generated by the Sujiahe formation and the low Permian high quality source rock migrated vertically or laterally through the fault channel to form a gas reservoir in the high quality reservoir of the Laikoupo formation. The favorable disposition of hydrocarbon expulsion peak period, fault development and trap forming period of source rock in time and space are the key to reservoir formation of Leikoupo formation.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:P618.13
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