本文選題：普光地區(qū)　切入點(diǎn)：三疊系　出處：《長江大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：普光氣田位于四川盆地東北部,北面緊鄰大巴山前緣推覆構(gòu)造帶,面積1116km2。普光氣田主體陸相位于四川盆地川東斷褶帶黃金口構(gòu)造帶普光—雙石廟北東向構(gòu)造帶的北端,介于大巴山推覆帶前緣斷褶帶與川中平緩褶皺帶之間。本區(qū)陸相地層同四川盆地基本相似。多年的勘探開發(fā)實(shí)踐表明,該區(qū)除了海相碳酸鹽巖地層外,三疊統(tǒng)發(fā)育的陸相層系亦具有很好的勘探潛力。本論文針對普光地區(qū)陸相地層須家河組進(jìn)行研究,從構(gòu)造、沉積相、儲(chǔ)層特征研究等多方面分析,深度剖析該陸相地層在油氣勘探方面的潛力,并明確潛力的分布特征,對該區(qū)陸相地層的勘探具有指向性的意義。在對獲取的巖心、測井、錄井、分析化驗(yàn)數(shù)據(jù)和地震數(shù)據(jù)等多方面資料詳細(xì)研究和分析,結(jié)合前人對本地區(qū)的深入研究成果,得到了一下幾個(gè)方面的成果：1、本工區(qū)在須家河組沉積時(shí)期,位于東北方向的川東北大巴山造山帶為本地區(qū)帶來了大量的陸源碎屑,是最為主要的沉積物來源；2、須家河組沉積時(shí)期,研究區(qū)地勢較為平緩,坡度不大,主要以發(fā)育淺水辮狀河三角洲沉積為主。其中平原亞相是該沉積時(shí)期最為發(fā)育的亞相,分布的面積最廣,厚度也最大。據(jù)劃分和統(tǒng)計(jì),本區(qū)須家河組共發(fā)育三種沉積亞相,共八種微相。3、通過細(xì)致的地層對比及沉積相刻畫工作,須二、四、六段的沉積厚度較大,砂地比值較高,而須三、五段的沉積厚度薄,以發(fā)育泥質(zhì)沉積為主,砂體比低。在各段中,須二段河道砂體最為發(fā)育,河道疊置的厚層砂體分布最廣,連續(xù)性最好,其次是須四段、須六段；4、數(shù)據(jù)分析本區(qū)儲(chǔ)層砂巖的磨圓和分選較好,結(jié)構(gòu)成熟度相對較高,但成分成熟度較低,其長石、巖屑的含量略高,砂巖類型三角圖顯示本區(qū)主要發(fā)育長石巖屑質(zhì)石英砂巖為主,其次為長石質(zhì)巖屑砂巖。碎屑粒徑主要為細(xì)粒及粉粒,少量中粒和粗粒砂巖。在須家河組四段底部出現(xiàn)有典型的河床沉積雜色礫巖出現(xiàn)；5、分析化驗(yàn)結(jié)果顯示須家河組砂巖儲(chǔ)層經(jīng)受了強(qiáng)烈、復(fù)雜的成巖作用,其中最為典型且作用最強(qiáng)烈的成巖作用,表現(xiàn)為壓實(shí)／壓溶作用、膠結(jié)作用、破裂作用及溶解作用等。前兩者使儲(chǔ)層的原生孔隙受到大幅度壓縮,以致原生孔隙消失不見,兩者互相關(guān)聯(lián),共同損害者儲(chǔ)層的原始物性,是研究區(qū)砂巖達(dá)到致密主要原因；而后兩者則是提升儲(chǔ)層物性的具有建設(shè)性的成巖作用,兩者相輔相成,互相聯(lián)系,為致密砂巖中發(fā)育優(yōu)質(zhì)儲(chǔ)層提供了條件。破裂作用導(dǎo)致裂縫普遍分布,這是研究區(qū)最具特色的建設(shè)性的成巖作用,破裂作用產(chǎn)生裂縫是儲(chǔ)層最廣泛的儲(chǔ)集空間,或成為溶蝕作用的通道,促進(jìn)溶蝕作用發(fā)生與擴(kuò)展,對溶蝕孔、縫的形成具有重要意義,因而溶解作用常與破裂作用相伴生。交代作用則與溶解作用混合發(fā)生,普遍發(fā)生在粘土礦物對長石和石英之間,可形成晶間孔。6、經(jīng)細(xì)致研究發(fā)現(xiàn)須家河組巖層樣品多方面特征嚴(yán)格符合中成巖B期—晚成巖期的巖石特征,結(jié)合前人成果明確本區(qū)須家河組地層成巖期次已達(dá)到中成巖B期,甚至部分到晚成巖期；7、本區(qū)儲(chǔ)層成巖相類型可劃分為長石溶蝕+破裂相；硅質(zhì)膠結(jié)相；伊利石—方解石膠結(jié)相等三種成巖相。其中硅質(zhì)膠結(jié)相、伊利石—方解石膠結(jié)相發(fā)育的地方往往物性較差,而長石溶蝕+破裂相是有利的成巖相,其所在的區(qū)域可成為油氣勘探的重點(diǎn)；8、儲(chǔ)層致密,物性指標(biāo)顯示該類儲(chǔ)層屬于致密砂巖儲(chǔ)層。儲(chǔ)層儲(chǔ)集空間以次生溶孔、微裂縫為主,微孔次之；裂縫對致密砂巖儲(chǔ)層的物性影響很大,次生溶孔的發(fā)育與裂縫有著密切的關(guān)系。裂縫發(fā)育的地方往往孔隙度和滲透率值高,是氣藏發(fā)育的有利地帶。而裂縫主要發(fā)在須家河組二段、四段的厚層砂體中,因此這兩層是須家河組氣層發(fā)育的最具潛力層位。
[Abstract]:Puguang gas field is located in the northeast of Sichuan basin, adjacent North foreland of Daba Mountain nappe tectonic belt, the main continental area of 1116km2. in Puguang gas field is located in the Sichuan basin in East Sichuan Puguang structure belt gold bruchfalten mouth - shuangshimiao NE trending tectonic belt between North Dabashan nappe belt and Sichuan bruchfalten front flattish fold belt. The continental strata in Sichuan basin with similar shows. The exploration and development practice for many years, in addition to the marine carbonate strata, three Permian continental strata development also has good exploration potential. This thesis focuses on the continental facies in Puguang area of Xujiahe formation were studied from the structure, sedimentary facies analysis. Study on reservoir characteristics and other aspects, in-depth analysis of the potential of continental strata in oil and gas exploration, and the distribution characteristics of clear potential, in the area of continental strata exploration has directional significance. In the Core, logging, logging, test data and seismic data and other aspects of detailed research and analysis, combined with previous results of research in this area, have the following several aspects: 1, this area in Xujiahe Formation sedimentary period, brought a lot of terrigenous debris is located in the northeast of the northeastern Sichuan bus orogenic belt for the region, is the main source of sediment; 2, Xujiahe Formation sedimentary period, the study area terrain is relatively flat, slope, mainly in the development of Braided River Delta in shallow water. The plain subfacies is the sedimentary period of the most developed sub facies, distribution area wide, thickness is also the largest. According to the classification and statistics, the Xujiahe Group has developed three types of sedimentary subfacies and eight microfacies.3, through detailed stratigraphic correlation and sedimentary facies characterization, two, four, six section thickness, sand ratio Higher to three, five of the thickness of thin, with the development of mud, sand ratio is low. In each segment, to sand river two most developed river stacked thick sand bodies most widely distributed, most continuous, second is to the four paragraph, paragraph six shall 4, data analysis; grinding and separation of reservoir in this area is good, the structure maturity is relatively high, but the low compositional maturity, the feldspar, lithic content is slightly higher, the sandstone type triangle shows the main development of feldspar detritus quartz sandstone, followed by feldspathic lithic sandstone detrital grain. Size are fine and powder, small grain and coarse grain sandstone of Xujiahe formation. In the four section appears at the bottom of the typical riverbed deposits have mottled conglomerate; 5, analysis of the test results show that the sandstone reservoirs of Xujiahe Formation underwent strong and complex diagenesis, one of the most typical and the most strong diagenesis as Used as compaction / pressolution, cementation, fracturing and dissolution. The primary pores of the reservoir is greatly compressed, so that the primary pores disappear, mutual relation, common original object of reservoir damage, is the main reason to dense sandstone in the study area; and the two is to enhance the constructive diagenesis, the reservoir properties of the two complement each other, contact each other, provide the conditions for the development of tight sandstone reservoir quality. Fracturing cause cracks are widely distributed, the constructive diagenesis of the study area is the most distinctive, fracturing cracks is in space the most widely used storage reservoir, or become the dissolution channel, promote the dissolution and expansion of pores, cracks has important significance to the formation, dissolution and fracturing and often associated with dissolution metasomatism. Effect of mixing that occurs commonly occur in clay minerals on feldspar and quartz, can form intergranular pore.6, after careful study found that the Xujiahe Formation in strict compliance with the characteristics of samples into late diagenetic characteristics of rock rock B, combined with previous results made clear the area Xujiahe Formation diagenetic stage time has reached the middle diagenetic stage B, or even to the late diagenetic stage; 7, the reservoir diagenetic facies can be divided into the dissolution of feldspar + rupture; siliceous cementation facies; illite calcite cementation are three types of diagenetic facies. The siliceous cementation facies, illite, calcite cementation facies. The place is often poor, and the dissolution of feldspar + rupture were the favorable diagenetic facies. The area where it can become the focus of the oil and gas exploration; 8, the tight reservoir, the physical index shows that the reservoir belongs to tight sandstone reservoir. The reservoir space is secondary pore, micro crack Micro crack, secondary; influence of cracks on the tight sandstone reservoir, secondary karst hole and cracks are closely related. Local cracks tend to high porosity and permeability values, gas reservoir is favorable for development zone. And the main cracks in Xujiahe Formation in two, thick sand body in the four, the two layer is the Xujiahe formation and development of the most promising horizon.

【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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本文編號(hào)：1590574