本文選題：開江-梁平海槽東南緣　切入點：長興組　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：開江-梁平地區(qū)上二疊統(tǒng)長興組作為區(qū)域內(nèi)重要的天然氣產(chǎn)層,受到了國內(nèi)的廣泛關(guān)注,但針對長興組沉積相和儲層的發(fā)育分布規(guī)律意見不一。本文以經(jīng)典層序地層學(xué)、沉積學(xué)及儲層地質(zhì)學(xué)等為理論指導(dǎo),以開江-梁平海槽東南緣上二疊統(tǒng)長興組為對象,通過分析區(qū)內(nèi)鉆測井、巖心薄片、地震剖面及鄰區(qū)露頭資料,對長興組進行地層劃分,建立層序地層格架,并在格架內(nèi)對長興組沉積相及儲層展開研究,厘清了長興組儲層發(fā)育與層序、沉積相的關(guān)系,確定了長興組儲層的發(fā)育分布規(guī)律。 根據(jù)巖石類型組合、沉積旋回等特征,研究區(qū)長興組自下而上可劃分為長一段(P3chl)、長二段(P3ch2)和長三段(P3ch3)。同時,通過巖心薄片、鉆錄測井和地震剖面等資料分析,長興組可劃分為兩個均由海侵域(TST1)、TST2)和高位域(HST1、HST2)組成的Ⅱ型三級層序(SQ1、 SQ2),并建立三級層序地層格架。其中,TSTl、HST1、TST2-HST2分別與長一段、長二段、長三段對應(yīng),區(qū)域可對比性好。 結(jié)合巖心薄片與鉆測井等資料對長興組進行沉積相分析,以體系域為單元,等時動態(tài)地揭示了研究區(qū)長興組沉積相(尤其礁灘相)的時空分布及演化。TST1時期,區(qū)內(nèi)以開闊臺地沉積為主,局部發(fā)育生屑灘,其后期臺緣相帶雛形形成；HST1時期,礁灘相大規(guī)模分布,臺地邊緣迅速沉積增厚,臺緣相帶演化成熟,臺地內(nèi)以開闊臺地為主,局部發(fā)育生屑灘；TST2時期,繼承了前期相帶分布格局,但臺緣礁灘相規(guī)模明顯縮小,臺地內(nèi)以開闊臺地為主,局部發(fā)育生屑灘；HST2早期,臺緣礁僅五百梯地區(qū)有小規(guī)模分布,末期臺緣帶局部發(fā)育潮坪沉積,開闊臺地演變?yōu)榫窒夼_地。 綜合巖心薄片、測錄井和物性資料等分析,長興組主要發(fā)育生物礁相云巖或灰?guī)r類、生屑灘相云巖或灰?guī)r類、潮坪或礁坪或灘后坪晶粒云巖類溶蝕孔隙(洞)型儲層,以云巖類儲集性最佳,灰?guī)r類次之。垂向上,長興組儲層主要發(fā)育于高位域中后期,與生物礁灘相沉積體系關(guān)系密切,主要分布在向上水體變淺的單體礁灘相沉積體系的中上部,溶蝕、云化作用強烈,孔洞發(fā)育好；而海侵域時期或在向上水體變深的單體礁灘相沉積體系中,溶蝕、云化程度低,以灰?guī)r類儲層為主,孔隙性較差。平面上,長興組儲層主要分布在臺地邊緣相帶和臺地內(nèi)部,斜坡-海槽區(qū)儲層不發(fā)育。根據(jù)儲層類型、溶蝕云化程度及規(guī)模、優(yōu)質(zhì)儲層數(shù)量及規(guī)模等指標(biāo),研究區(qū)可定性劃分為4類長興組儲層發(fā)育區(qū)：溶蝕、云化作用強烈且規(guī)模較大的臺緣礁灘相分布區(qū)屬于Ⅰ類發(fā)育區(qū),溶蝕、云化作用較強的臺緣礁灘相或臺內(nèi)淺灘相分布區(qū)屬于Ⅱ類發(fā)育區(qū),溶蝕、云化較弱的臺緣或臺內(nèi)淺灘相灰?guī)r沉積區(qū)屬于Ⅲ類發(fā)育區(qū),而開闊臺地或局限臺地內(nèi)非礁灘相灰?guī)r沉積區(qū)屬于Ⅳ類發(fā)育區(qū)。
[Abstract]:The Changxing formation of Upper Permian in Kaijiang-Liangping area, as an important natural gas layer in the region, has received extensive attention in China, but there are different opinions on the development and distribution of sedimentary facies and reservoirs in Changxing formation.Based on the theory of classical sequence stratigraphy, sedimentology and reservoir geology, and taking the upper Permian Changxing formation in the southeast margin of Kaijiang-Liangping trough as the object, this paper analyzes the drilling log, core slice, seismic profile and outcrop data of adjacent areas.The stratigraphic division of Changxing formation, the establishment of sequence stratigraphic framework, the study of sedimentary facies and reservoir of Changxing formation in the framework, the relationship between reservoir development and sequence and sedimentary facies of Changxing formation, and the distribution law of reservoir development in Changxing formation are clarified.According to the characteristics of rock type assemblage and sedimentary cycle, the Changxing formation in the study area can be divided from the bottom to the top into long first member P3chlang, long second member P3ch2) and Chang3 member P3ch3.At the same time, the Changxing formation can be divided into two types: type 鈪，

本文編號：1713415