本文選題：四川盆地 + 致密油氣�。� 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：四川盆地位于揚(yáng)子板塊西緣,是富含天然氣的大型沉積盆地。除了高產(chǎn)常規(guī)天然氣外,四川盆地還富集非常規(guī)油氣,例如煤層氣、頁巖氣、致密砂巖油氣、致密碳酸鹽巖油氣等。其中致密油氣是本文的研究對象,通過廣泛收集資料,并分析總結(jié)前人的研究成果,以川西新場地區(qū)上三疊統(tǒng)須家河組和川中地區(qū)下侏羅統(tǒng)大安寨段為例,進(jìn)行致密油氣的形成條件研究,并對四川盆地須家河組和大安寨段進(jìn)行有利區(qū)帶優(yōu)選,進(jìn)行致密油氣勘探開發(fā)綜合評價(jià)和區(qū)劃。四川盆地從震旦系到侏羅系發(fā)育了多套致密油氣成藏組合,粗略劃分為下古生界、下二疊統(tǒng)、上三疊統(tǒng)致密氣成藏組合和侏羅系致密油成藏組合,有自生自儲(chǔ)、新生古儲(chǔ)、古生新儲(chǔ)三種油氣成藏模式,各套成藏組合均為近源、自源充注,源儲(chǔ)疊置或緊鄰。其中,上三疊統(tǒng)致密氣成藏組合和下侏羅統(tǒng)致密油成藏組合屬于自生自儲(chǔ)型,烴源巖和儲(chǔ)層相互疊置,呈“千層餅”狀,便于油氣生成后直接進(jìn)入儲(chǔ)層聚集,有利于致密油氣的形成。通過對烴源巖的分析,得知該區(qū)須家河組烴源巖為含煤炭質(zhì)泥巖,生成煤型氣,向儲(chǔ)層內(nèi)供烴;大安寨段烴源巖為大一三亞段暗色泥巖,主要生油,向上下兩個(gè)亞段雙向供烴。新場須家河組儲(chǔ)層巖性以巖屑砂巖為主,孔滲性較差,為致密砂巖儲(chǔ)層;川中地區(qū)大安寨段儲(chǔ)層巖性以介殼灰?guī)r為主,物性極差,在裂縫連通孔隙的作用下,成為致密碳酸鹽巖儲(chǔ)層。在研究了儲(chǔ)層特征的基礎(chǔ)上,探討了儲(chǔ)層的控制因素及源儲(chǔ)關(guān)系,并對該盆地須家河組、大安寨段儲(chǔ)層進(jìn)行有利區(qū)帶優(yōu)選,圈定須家河組的5個(gè)優(yōu)選區(qū)塊,大安寨段4個(gè)優(yōu)選區(qū)塊,用容積法對大安寨段有利區(qū)塊進(jìn)行地質(zhì)資源量計(jì)算,并選擇評價(jià)指標(biāo)對各區(qū)塊進(jìn)行綜合評價(jià)及區(qū)劃,將其劃分為優(yōu)先勘探(開發(fā))區(qū)、次級勘探(開發(fā))區(qū)和勘探(開發(fā))后備區(qū)。通過綜合評價(jià)與區(qū)劃,得到大安寨段致密油的優(yōu)先勘探區(qū)為川中區(qū)塊Ⅰ,優(yōu)先開發(fā)區(qū)為川中區(qū)塊Ⅰ和川東區(qū)塊Ⅲ,須家河組致密氣的優(yōu)先勘探區(qū)為川西的區(qū)塊Ⅰ和區(qū)塊Ⅴ,優(yōu)先開發(fā)區(qū)為川西的區(qū)塊Ⅰ。
[Abstract]:Sichuan Basin, located on the western margin of Yangtze plate, is a large sedimentary basin rich in natural gas. In addition to high production of conventional natural gas, the Sichuan Basin also accumulates unconventional oil and gas, such as coalbed methane, shale gas, tight sandstone oil and gas, tight carbonate oil and gas, and so on. Dense oil and gas is the research object of this paper. Through extensive collection of data and analysis and summary of previous research results, taking the Upper Triassic Xujiahe formation of Upper Triassic and the Lower Jurassic Da'anzhai formation of Central Sichuan area as examples, The forming conditions of dense oil and gas are studied, and the favorable zones are selected for the Xujiahe formation and Da'anzhai formation in Sichuan Basin, and the comprehensive evaluation and regionalization of dense oil and gas exploration and development are carried out. From Sinian to Jurassic, there are several sets of tight oil-gas accumulation assemblages in Sichuan Basin, which are roughly divided into Lower Paleozoic, Lower Permian, Upper Triassic tight Gas accumulation assemblages and Jurassic tight Oil accumulation assemblages. There are three types of new Paleozoic reservoir forming models, each set of reservoir forming assemblage is near source, self-source filling, source superposition or close proximity. Among them, the upper Triassic tight gas accumulation assemblage and the Lower Jurassic tight oil accumulation assemblage belong to the autogenetic self-reservoir type. The hydrocarbon source rocks and the reservoir superposition each other in the form of "thousand layers cake", which is convenient for oil and gas generation to enter the reservoir directly after accumulation. It is favorable to the formation of dense oil and gas. Through the analysis of the source rock, it is known that the source rock of Xujiahe formation is coal-bearing mudstone, which generates coal type gas and supplies hydrocarbon to the reservoir, and the source rock of Da'anzhai member is dark mudstone of the first and third sub-member, which mainly generates oil and supplies hydrocarbon to the upper and lower subsections in both directions. The reservoir lithology of Xinchang Xujiahe formation is dominated by lithic sandstone with poor porosity and permeability, which is a tight sandstone reservoir, and the reservoir lithology of Da'anzhai member in central Sichuan area is dominated by meso-shell limestone, and its physical property is extremely poor. A tight carbonate reservoir. Based on the study of reservoir characteristics, the controlling factors of reservoir and the relationship between source and reservoir are discussed. The favorable zones of Xujiahe formation and Da'anzhai formation in this basin are selected, and the 5 optimal selection blocks of Xujiahe formation are delineated. The volume method is used to calculate the geological resource quantity of the favorable block in Da'anzhai section, and the comprehensive evaluation and zoning of each block are carried out by selecting the evaluation index, which is divided into priority exploration (development) area. Secondary exploration (exploitation) area and exploration (exploitation) reserve area. Through comprehensive evaluation and regionalization, it is obtained that the preferential exploration area of dense oil in Da'anzhai section is block I of central Sichuan, the priority zone of development zone is block 鈪，

本文編號(hào)：2032278