【摘要】：近年來,川中南部地區(qū)上寒武統(tǒng)洗象池組因處于相同構(gòu)造條件的下寒武統(tǒng)龍王廟組發(fā)現(xiàn)特大油氣田而成為現(xiàn)今重要的勘探領(lǐng)域之一,但前人針對(duì)川中南部地區(qū)上寒武統(tǒng)洗象池組的研究并不多,故本次研究結(jié)合前人的研究成果,以川中南部地區(qū)為研究區(qū),以上寒武統(tǒng)洗象池組為目的層,綜合利用巖芯觀察、薄片鑒定、地球物理解釋(測(cè)井和地震)和孔滲實(shí)驗(yàn)測(cè)試等多種研究方法,對(duì)上寒武統(tǒng)洗象池組的層序地層進(jìn)行識(shí)別和劃分,并對(duì)研究區(qū)域內(nèi)的沉積相類型及分布特征進(jìn)行了詳細(xì)的研究。本次研究取得了以下主要成果:(1)在層序劃分方面主要是劃分出了一個(gè)三級(jí)層序。上寒武統(tǒng)洗象池組劃分為1個(gè)三級(jí)層序,即SQ1,洗象池組與下部高臺(tái)組無沉積間斷,整合接觸,是三級(jí)層序SQ1底界面;洗象池組與上部桐梓組整合接觸,該界面是三級(jí)層序SQ1頂界面;層序內(nèi)部包含1個(gè)最大海泛面(mfs1),1個(gè)高位體系域早期-高位體系域晚期轉(zhuǎn)換面((E-L)TS)。SQ1包含3個(gè)體系域,即TST、EHST和LHST。SQ1-TST底頂界分別為洗象池底界和mfs1;SQ1-EHST底頂界分別為mfs1和(E-L)TS;SQ1-LHST底頂界分別為(E-L)TS和洗象池頂界。缺失LST。在SQ1中,巖相、測(cè)井相和地震相的變化反映了1個(gè)完整的水進(jìn)-水退沉積旋回。TST、EHST和LHST分別對(duì)應(yīng)洗一段、洗二段和洗三段。(2)研究區(qū)域總體為局限臺(tái)地沉積環(huán)境。此次共識(shí)別出了臺(tái)坪、臺(tái)內(nèi)灘和瀉湖三種亞相以及砂泥質(zhì)云坪、云坪、砂屑灘、泥云質(zhì)瀉湖和云質(zhì)瀉湖五種微相。在沉積相分布上,洗一段主要發(fā)育局限臺(tái)坪亞相,東部局部地區(qū)發(fā)育臺(tái)內(nèi)灘亞相。洗二段主要發(fā)育局限瀉湖亞相,研究區(qū)中部和東部大面積發(fā)育臺(tái)內(nèi)灘亞相。洗三段主要發(fā)育局限臺(tái)坪亞相,研究區(qū)東部大面積發(fā)育臺(tái)內(nèi)灘亞相。(3)研究區(qū)物性整體較差,不同沉積相帶比較而言,臺(tái)內(nèi)灘具有明顯較好的物性,臺(tái)坪次之,瀉湖最差。原因主要有三方面,一是臺(tái)內(nèi)灘的沉積環(huán)境為動(dòng)蕩的高能量環(huán)境使得臺(tái)內(nèi)灘亞相沉積的殘余砂屑被淘洗干凈,保留了較好的原生孔隙,而同期的局限瀉湖亞相和局限臺(tái)坪亞相因處在低能環(huán)境中,原生孔隙發(fā)育較差;二是后期的埋深溶蝕作用,對(duì)臺(tái)內(nèi)灘亞相粒間孔進(jìn)行了建設(shè)性改造,酸性流體的充注使得原生孔隙進(jìn)一步擴(kuò)大;三是后期的構(gòu)造運(yùn)動(dòng)產(chǎn)生的構(gòu)造縫將后期埋藏溶蝕作用形成的粒間孔和溶洞連通起來,大大改善了臺(tái)內(nèi)灘亞相的物性。(4)研究區(qū)內(nèi)有利的沉積相主要大面積分布在東部,西部磨溪構(gòu)造因遭受后期的構(gòu)造剝蝕而小范圍的發(fā)育臺(tái)內(nèi)灘亞相。其中洗一段(SQ1-TST)在高石21井、合12井,廣探2井和南充1井發(fā)育殘余砂屑云巖和砂屑云巖為主的臺(tái)內(nèi)灘;洗二段(SQ1-EHST)在安平1井、磨溪21井-磨溪23井、高石23井-高石7井-高石8井、高石16井、女基井-女深5井和高石21井-合12井-廣探2井發(fā)育臺(tái)內(nèi)灘;洗三段(SQ1-LHST)在安平1井、寶龍1井-女基井-磨溪23井、南充1井和高石21井-合12井-廣探2井發(fā)育臺(tái)內(nèi)灘。
[Abstract]:In recent years, the upper Cambrian washing pool in the middle and southern Sichuan Province has become one of the most important exploration fields because of the discovery of large oil and gas fields in the lower Cambrian dragon Wang Temple formation at the same tectonic conditions, but the previous research on the upper Cambrian washing pool group in the middle and Southern Sichuan is not much. The south area is the research area, and the Cambrian washing pool is the target layer. The sequence stratigraphy of the upper Cambrian washing pool group is identified and divided, and the types and distribution characteristics of the sedimentary facies in the study area are identified and divided by a variety of research methods, such as core observation, thin slice identification, geophysical interpretation (logging and earthquake) and pore permeability test. The main achievements of this study are as follows: (1) the sequence division is mainly divided into a three order sequence. The upper Cambrian washing pool group is divided into 1 three order sequences, that is, SQ1, the washing pool group and the lower high platform group have no depositional discontinuity and integrated contact, which are the bottom boundary of the order SQ1 of the three order sequence; the washing pool group and the upper Tung The interface is integrated contact, the interface is the SQ1 top interface of the three order sequence; the sequence contains 1 most sea surface (mfs1), and the 1 high system domain early high system domain late transition surface ((E-L) TS).SQ1 contains 3 system domains, namely, TST, EHST and LHST.SQ1-TST bottom boundary are respectively the bottom of the wash pool and mfs1; SQ1-EHST bottom boundary is mfs1 and (E-L) respectively. The bottom boundary of 1-LHST is (E-L) TS and the top of the washing pool, respectively. The absence of LST. in SQ1, lithofacies, log phase and seismic phase change reflect 1 complete water to water retrograde sedimentary cycles.TST, EHST and LHST correspond to the washing section, washing two segments and three segments. (2) the study area is the limited platform sedimentary environment. This time the platform was identified and the platform was identified. Three subfacies of beach and lagoons and five microfacies of sandy muddy cloud flat, Yun Ping, sand chip beach, muddy lagoon and cloud lagoon. In the distribution of sedimentary facies, the main development restricted platform subfacies, the eastern part of the region developed the subfacies of the platform inner beach. The two segments of the washing area are mainly restricted lagoon subfacies, and the central and eastern part of the study area developed large area subtropical beach subfacies. Phase. The main development Limited Tai Ping subfacies in the three section of the study, the large area in the eastern part of the study area, the subfacies of the large area of the inner beach. (3) the study area has a relatively poor physical property. In comparison with the sedimentary facies, the flat beach has obvious good physical property, the platform is the second and the lagoon is the worst. The main reasons are three aspects, the first is the high energy environment of the sedimentary environment of the flat beach. The residual sand debris in the subfacies of the Taiwan beach is washed clean, and the better primary pores are preserved, while the primary pores are poorly developed in the limited lagoon and the Limited Taiwan plateau in the same period because of the low energy environment. Two is the later buried depth dissolution, and the intergranular intergranular pore in the flat beach is reformed and the acid fluid is filled. The primary pores are further expanded; three the structural seams produced by the later tectonic movement connect the intergranular pores and karst caves formed by later buried dissolution. (4) the favorable sedimentary facies in the study area are mainly distributed in the eastern part and the Western Moxi structure is subjected to late structural erosion. And a small range of development platform subfacies. Among them, SQ1-TST is in the high stone 21 well, 12 well, Guangzhou 2 well and Nanchong 1 well developed residual sand debris dolomite and sand crumb dolomite, and two segments (SQ1-EHST) in Anping 1, Moxi 21 - Moxi 23, high stone 23 well - 7 well - 7 well - Gao Shi 8, Gao Shi 16 well, female base well - female Shen 5 well and Gao Shi 2 1 well - 12 well - Guangzhou 2 well developed platform inner beach; washing three section (SQ1-LHST) in Anping 1 well, Baolong 1 - female base well - Moxi 23, Nanchong 1 well - 21 well - 12 well - 12 well - Guangzhou - 2 well development platform.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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