本文選題：四川盆地 + 高石梯-磨溪構造　； 參考：《成都理工大學》2017年碩士論文

【摘要】：川中古隆起是一個繼承性發(fā)育的大型加里東期剝蝕古隆起,古隆起東段高部位是天然氣富集有利區(qū),高石梯-磨溪構造便位于古隆起的東段。截至2013年底,高石梯一磨溪地區(qū)寒武系龍王廟組已探明天然氣地質(zhì)儲量4404×10~8m~3。龍王廟組巖石類型主要為晶粒白云巖、殘余砂屑白云巖、殘余鮞粒白云巖等,儲集空間類型為粒間晶間孔,部分為粒間晶間溶孔、粒內(nèi)溶孔、鑄�？�、生物潛穴/生物鉆孔及溶縫。通過巖心觀察、巖石薄片觀察,認為高石梯—磨溪構造龍王廟組孔洞縫中礦物充填的世代關系為:晶粒狀白云石→瀝青→石英。對龍王廟組圍巖及孔洞充填的白云石開展了鍶、碳、氧同位素的分析,并對比了他們之間的差異性,認為圍巖和晶洞充填的白云石的~(87)Sr/~(86)Sr比值均明顯高于同期寒武紀海水的~(87)Sr/~(86)Sr比值,充填的白云石~(87)Sr/~(86)Sr比值和圍巖沒有明顯的差異,這種富鍶流體明顯的改造了圍巖,在孔洞中沉淀晶粒狀的白云石。晶洞中充填的白云石δ~(13)C、δ~(18)O同位素和圍巖的差值相對較小,但晶洞充填的白云石的δ~(18)O比圍巖更偏負,表明充填的白云石可能是在相對更高的溫度下沉淀的。對孔洞中充填的石英開展了硅、氧同位素和包裹體氫同位素的分析。研究認為,磨溪構造龍王廟組儲層孔洞中充填的石英的流體源為成巖流體,和巖漿水及變質(zhì)水等無關。石英礦物的~(87)Sr/~(86)Sr比值表明,沉淀石英的富硅質(zhì)的地層水為外來的富鍶流體,結合氫-氧同位素的特征認為這種富鍶的硅質(zhì)流體可能是由最初的大氣淡水或與海水混合并封存演化而來的地層水。以孔洞中充填的礦物序列為主線,通過對包裹體巖相學、激光拉曼、均一溫度等分析,認為川中高石梯-磨溪構造龍王廟組至少存在四期油氣充注。不同期次流體包裹體的特征,表明了油藏流體由液態(tài)烴(古油藏)→液態(tài)烴+氣態(tài)烴(古油氣藏)→油裂解為天然氣(古油氣藏)→氣態(tài)烴(天然氣藏)的過程。通過包裹體均一溫度及龍王廟組埋藏-熱演化歷史厘定了油氣充注時間,并通過石英礦物包裹體的~(40)Ar—~(39)Ar定年分析,將龍王廟組天然氣成藏的時間確定為125.80±8.20Ma。利用鍶同位素地球化學數(shù)據(jù)以及現(xiàn)今地層壓力的資料,建立了龍王廟組流體體系,認為龍王廟組天然氣成藏期未表現(xiàn)出流體跨層流動的跡象,氣藏具有優(yōu)越的保存條件。
[Abstract]:The central Sichuan paleouplift is a large Caledonian denuded paleouplift which is inherited and developed. The upper part of the eastern part of the paleouplift is a favorable area for natural gas enrichment, and the Gaoshitian-Moxi structure is located in the eastern part of the paleouplift. By the end of 2013, the Cambrian Longwangmiao formation in the Gaoshitiyimoxi area had proved gas reserves of 4404 脳 10 ~ (8) mm ~ (3). The rock types of Longwangmiao formation are mainly grain dolomite, residual sand dolomite, residual oolitic dolomite, etc. The reservoir space type is intergranular pore, partly intergranular dissolved pore, intragranular dissolved pore, mold pore, etc. Biological submersible / biological drilling and dissolving. Based on core observation and thin slice observation, it is considered that the intergenerational relationship of mineral filling in the hole joint of the Longwangmiao formation of Gaosita-Moxi structure is: granular dolomite bitumen and quartz. The strontium, carbon and oxygen isotopes of dolomite filled with surrounding rocks and holes in Longwangmiao formation were analyzed, and their differences were compared. It is considered that the ratios of the rock rocks and the dolomite filled with crystal caverns are obviously higher than those of the Cambrian seawater during the same period, but there is no obvious difference between the ratio of 87 ~ (87) Sr ~ (- / -) ~ (86) Sr ~ + and the surrounding rock, and the strontium rich fluid has obviously modified the surrounding rock. A dolomite precipitated in a hole. The 未 ~ (13) C, 未 ~ (18) O isotopes of dolomite filled in crystal caverns are relatively small, but the 未 ~ (18) ~ (18) O value of dolomite filled with crystal caverns is more negative than that of surrounding rocks, indicating that the dolomite filled with dolomite may have precipitated at a relatively high temperature. Silicon, oxygen and inclusion hydrogen isotopes were analyzed in quartz filled with pores. It is considered that the fluid source of quartz filled in the hole of Longwangmiao formation in Moxi structure is diagenetic fluid, independent of magmatic water and metamorphic water. The Sr / P / 86 Sr ratio of quartz minerals indicates that the silicon-rich formation water precipitated by quartz is an extraneous strontium rich fluid. Combining the characteristics of hydrogen and oxygen isotopes, it is suggested that this strontium rich siliceous fluid may be the formation water derived from the initial atmospheric fresh water or mixed with seawater and sealed. Taking the mineral sequence filled in the pores as the main line and analyzing the petrography, laser Raman and homogenization temperature of the inclusions, it is concluded that there are at least four stages of oil and gas filling in the Longwangmiao formation of the Gaoshi-Moxi structure in the middle of Sichuan. The characteristics of fluid inclusions in different periods indicate the process of fluid cracking from liquid hydrocarbon (paleo-reservoir) / liquid hydrocarbon (paleo-hydrocarbon) to natural gas (paleo-reservoir) / gaseous hydrocarbon (natural gas reservoir). Based on the homogenization temperature of inclusions and the burial and thermal evolution history of Longwangmiao formation, the filling time of oil and gas is determined, and the time of gas accumulation in Longwangmiao formation is determined to be 125.80 鹵8.20 Ma. The fluid system of Longwangmiao formation has been established by using strontium isotope geochemical data and the data of present formation pressure. It is considered that the gas reservoir of Longwangmiao formation did not show the sign of fluid flowing across layers during the reservoir forming period, and the gas reservoir has superior preservation conditions.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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