本文關(guān)鍵詞：四川盆地及周緣地區(qū)寒武系洗象池群巖相古地理研究　出處：《西南石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 巖相古地理 沉積相模式 顆粒灘 洗象池群 單因素 古隆起

【摘要】：本文定位于四川盆地及周緣地區(qū)寒武系洗象池群巖相古地理研究。綜合前人資料和相關(guān)研究成果,以123份野外剖面和41份鉆孔資料為主要依據(jù),運(yùn)用巖石地層學(xué)、生物地層學(xué)、碳酸鹽巖巖石學(xué)和碳酸鹽沉積學(xué)等相關(guān)理論,采用單因素分析多因素綜合作圖法編繪了洗象池群巖相古地理圖,揭示沉積期巖相古地理演化和分布特征,為后期研究區(qū)的油氣勘探提供參考。主要成果和認(rèn)識(shí)有： 1、通過(guò)對(duì)區(qū)域地質(zhì)背景和洗象池群殘余地層厚度展布特征分析認(rèn)為,研究區(qū)洗象池群地層總體具西北薄東南厚、地形上隆坳相間的展布特征。西接康滇古陸,北鄰摩天嶺古陸和漢南古陸,南部和東北部分別被仁懷-遵義-湄潭等地的黔中水下古隆起和鎮(zhèn)巴-城口-巫溪-神農(nóng)架等地呈帶狀的水下高地所環(huán)繞；而盆內(nèi)則具有川中樂(lè)山-龍女寺古隆起、巴中-通江等地和盆地東南緣赤水-基江-石柱兩個(gè)次坳；研究區(qū)的東北部和東南部分別與秦嶺洋和江南盆地相接。 2、研究區(qū)巖石類(lèi)型以碳酸鹽巖為主,其次是碎屑巖和變質(zhì)巖。碳酸鹽巖以白云巖為主,根據(jù)其成分、結(jié)構(gòu)和構(gòu)造等特征可進(jìn)一步細(xì)分為顆粒白云巖、細(xì)-中晶白云巖和泥-粉晶白云巖；石灰?guī)r在研究區(qū)東部比較發(fā)育,包括顆粒石灰?guī)r、灰泥石灰?guī)r及其過(guò)渡類(lèi)型；碎屑巖主要分布在研究區(qū)西北部,包括砂巖、粉砂巖和粘土巖等；而變質(zhì)巖以板巖、千枚巖和片巖為主。 3、從巖石類(lèi)型、沉積構(gòu)造、沉積旋回以及測(cè)井響應(yīng)特征等角度對(duì)區(qū)內(nèi)野外剖面和鉆孔資料的研究和分析,同時(shí)綜合前人的研究資料、成果以及相關(guān)地質(zhì)資料,認(rèn)為研究區(qū)洗象池群發(fā)育古陸、碳酸鹽巖臺(tái)地、臺(tái)地邊緣帶、斜坡和盆地等沉積環(huán)境,其中區(qū)內(nèi)碳酸鹽臺(tái)地發(fā)育甚是廣泛,可進(jìn)一步劃分出混積潮坪、臺(tái)坪、局限瀉湖、半局限瀉湖、蒸發(fā)-半局限瀉湖和臺(tái)內(nèi)灘六種次級(jí)環(huán)境單元。 4、結(jié)合上述分析,采用“單因素分析多因素綜合作圖”法,對(duì)研究區(qū)寒武系洗象池群巖相古地理進(jìn)行了研究,并建立了沉積相模式。認(rèn)為洗象池期四川盆地西北邊存在古陸；盆內(nèi)主要以局限瀉湖沉積為主,環(huán)境低能、水體受限,沉積物以灰色-深灰色泥云巖和泥晶云巖為主；盆地西南邊的峨邊、樂(lè)山等地發(fā)育陸源碎屑與碳酸鹽巖不同程度混積的混積潮坪亞相；盆地以南的金沙-湄潭一帶則發(fā)育具蒸發(fā)環(huán)境的蒸發(fā)-局限瀉湖亞相；而位于盆地外緣西南部鎮(zhèn)雄-珙縣和東部沿河-咸豐-五峰一帶,以石灰?guī)r和白云巖幾乎對(duì)等沉積,水體相對(duì)開(kāi)闊,發(fā)育半局限瀉湖亞相；顆粒灘主要分布在位于川中的樂(lè)山-龍女寺古隆起區(qū)、研究區(qū)南部金沙-湄潭-遵義的黔中古隆起區(qū)、東北緣城口-神農(nóng)架和東南緣江口-永順-桑植一帶的水下高地；向研究區(qū)東北和東南方向過(guò)渡為半深水斜坡和深水盆地相。
[Abstract]:This study focuses on the lithofacies paleogeography of Sichuan basin and its surrounding areas. The Cambrian XIXIANGCHI group of previous information and related research results, with 123 copies of 41 copies of field profile and drilling data as the main basis, using rock stratigraphy, biostratigraphy, carbonate petrology and carbonate sedimentology and other related theories, using the single factor analysis and comprehensive mapping the factor method making XIXIANGCHI group lithofacies palaeogeography map, reveal the depositional paleogeographic evolution and distribution characteristics, and provide reference for later research area of oil and gas exploration. The main achievements and knowledge are:
1, based on the regional geological background and XIXIANGCHI group of residual stratum thickness distribution analysis, the study area XIXIANGCHI group formation has overall northwest southeast thin thickness, distribution of uplift and depression terrain. The west of Kangdian old land, north of Motianling old land and Hannan old land south and northeast, respectively by Renhuai - Zunyi - Meitan, Guizhou in the ancient uplift and Zhenba Chengkou - Wuxi - Shennongjia, is surrounded by bands of underwater heights; and the basin is Sichuan in Leshan longnusi paleo uplift, Bazhong - Tongjiang and southeastern margin of Chishui basin based Jiang Shizhu two times depression; the study area of the northeast and southeast are respectively connected with Qinling Mountains Ocean and the south of the Yangtze River Basin.
2 rock types in the study area, carbonate rocks, clastic rocks and metamorphic rocks. The carbonate rock is dolomite, according to its composition, structure and structure characteristics can be further divided into grain dolomite, fine MICROTEK dolostone and micritic dolomite; development of limestone in the study area in the East, including the particles of limestone, limestone plaster and transitional type; clastic rocks are mainly distributed in the northwest of the study area, including sandstone, siltstone and clay rocks and metamorphic rocks; in slate, phyllite and schist.
3, from the tectonic and sedimentary rock types, sedimentary cycles and logging response characteristics of research and analysis of the field profile and drilling data, and research data based on previous results, and the related geological data, it is concluded that the development of palaeocontinental XIXIANGCHI group, carbonate platform, platform margin slope, sedimentary environment and the basin area, the carbonate platform development is very broad, can be further divided into mixed tidal flat, platform, restricted lagoon, semi restricted lagoon, the evaporation of semi restricted lagoon and intraplatform six secondary environmental units.
4, the combination of the above analysis, the single factor analysis and comprehensive mapping "method of multi factors of lithofacies palaeogeography of the Cambrian XIXIANGCHI group was studied, and the sedimentary facies model is built. That XIXIANGCHI period northwest of Sichuan basin are mainly confined to the basin land; lagoon sediments, water environment and low energy, limited, sediment the grey and dark grey argillaceous dolomite and micrite dolomite; the southwest edge of the Ebian basin, Leshan, the development of terrigenous clastic and carbonate rocks of different degree of hunji mixed tidal flat subfacies; basin to the south of Jinsha - Meitan area development environment with evaporation evaporation and restricted lagoon subfacies; and is located in the southwest the outer part of the basin of Eastern Gongxian and Zhenxiong River - Xianfeng - five peak area, with limestone and dolomite almost equal deposition, the water is relatively open, the development of semi restricted lagoon subfacies; particles are mainly distributed in the beach is located in Sichuan in Leshan longnvsi paleo uplift area, south of the research area, Jinsha - Meitan - Zunyi Middle Guizhou Uplift Area, northeastern and southeastern margin of Chengkou Shennongjia estuary - Yongshun - Sangzhi area under water upland; semi deep slope and deep-water basin phase transition to the study area in Northeast and Southeast.

【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P531;P618.13

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本文編號(hào)：1423433