【摘要】：四川盆地侏羅系地層作為重要的油氣勘探和開(kāi)發(fā)層系,近年來(lái)在油氣成藏以及富集規(guī)律方面取得了重要成果。但四川盆地不同地區(qū)的勘探程度參差不齊。四川盆地回龍地區(qū)侏羅系地層的研究對(duì)于明確川西探區(qū)侏羅系油氣資源分布特征,總結(jié)其富集規(guī)律具有重要意義。本次研究的目標(biāo)層位是四川盆地回龍地區(qū)大安寨段,旨在結(jié)合層序地層與沉積學(xué)研究,進(jìn)行層序地層劃分對(duì)比,建立該區(qū)的層序劃分方案,利用沉積巖心,野外露頭,測(cè)井剖面等資料劃分研究區(qū)沉積微相類型,建立研究區(qū)沉積模式,為該區(qū)勘探工作提供良好的理論和基礎(chǔ)。研究的主要內(nèi)容如下:(1)早侏羅世,四川盆地進(jìn)入了陸相湖盆沉積階段,在該沉積背景下,四川盆地沉積了一套河湖相地層,其中目的層回龍地區(qū)大安寨段為陸相湖泊沉積。(2)以陸相湖盆層序地層學(xué)為指導(dǎo),利用層序界面露頭標(biāo)志和測(cè)井識(shí)別標(biāo)志,結(jié)合前人對(duì)回龍地區(qū)的劃分方案,綜合測(cè)井、巖心、地球物理等資料,將四川盆地回龍地區(qū)大安寨段劃分為1個(gè)Ⅲ級(jí)層序和4個(gè)Ⅳ級(jí)層序(SSC1~SSC4)。詳細(xì)描述了各級(jí)旋回特征,結(jié)合單井資料,建立了該研究層段的層序地層格架,為進(jìn)一步的沉積相展布特征研究奠定了基礎(chǔ)。(3)川西回龍地區(qū)自流井組大安寨段發(fā)育湖相碳酸鹽巖和碎屑巖的混合沉積,結(jié)合野外露頭、鉆井巖心、測(cè)井和顯微組構(gòu)等資料的綜合分析,對(duì)該研究區(qū)混積巖沉積微相特征進(jìn)行了精細(xì)刻畫。研究認(rèn)為,回龍地區(qū)大安寨段屬湖泊混合沉積相,劃分為濱淺湖混合沉積和半深湖混合沉積兩個(gè)亞相,并將濱淺湖劃分為高能介殼灘,低能介殼灘,砂質(zhì)淺灘,淺湖泥等混合沉積微相。(4)按照“巖心相-單井相-連井相-沉積相展布”的研究流程,根據(jù)研究區(qū)砂巖,泥巖和灰?guī)r的厚度分布圖以及灰?guī)r地震相的平面展布,編制了回龍地區(qū)大安寨各層段的沉積相平面分布圖。(5)基于所劃分的混合沉積相的特征和四川盆地以及研究區(qū)回龍大安寨段在侏羅紀(jì)的沉積相演變過(guò)程,建立了回龍地區(qū)自流井組大安寨段混合沉積演化模式。得出結(jié)論:研究區(qū)湖相混合沉積主要受物源供給和水動(dòng)力條件的控制,在不同混合沉積微相控制作用下形成了不同類型的混積巖。
[Abstract]:Jurassic strata in Sichuan Basin, as an important layer of oil and gas exploration and development, have made important achievements in oil and gas accumulation and accumulation in recent years. However, the degree of exploration in different areas of Sichuan Basin is uneven. The study of Jurassic strata in Huilong area of Sichuan Basin is of great significance in clarifying the distribution characteristics of Jurassic oil and gas resources in the western Sichuan exploration area and summing up its enrichment law. The target horizon of this study is the Da'anzhai member in Huilong area, Sichuan basin. It aims at combining sequence stratigraphy and sedimentology research, carrying out sequence stratigraphic division and correlation, establishing sequence division scheme in this area, using sedimentary core and outcrop in the field. The data of logging section and other data are divided into sedimentary microfacies types in the study area, and the sedimentary model of the study area is established, which provides a good theory and foundation for the exploration work in this area. The main contents of the study are as follows: (1) in the early Jurassic, Sichuan Basin entered the continental lacustrine basin sedimentary stage, under this sedimentary background, Sichuan Basin deposited a set of fluvial and lacustrine facies strata. Among them, the Daanzhai formation in the Huilong area is a continental lacustrine deposit. (2) the sequence stratigraphy of the continental lacustrine basin is used as a guide, the outcrop mark of sequence interface and the logging identification mark are used, and combined with the division scheme of Huilong area by predecessors, the logging is synthesized. According to the data of core and geophysics, the Da'anzhai formation in Huilong area, Sichuan Basin, is divided into one class 鈪，

本文編號(hào)：2323215