本文選題：川西坳陷中段　切入點：層序地層　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：川西坳陷中段地區(qū)位于四川盆地西部川西平原,屬川西坳陷,面積大約8000km2。該地區(qū)最近幾十年的油氣勘探主要集中于中新生代陸相地層,并取得了較好的油氣勘探成果,而海相油氣勘探程度極低,僅有少數(shù)鉆井鉆至海相地層,川科1井鉆至嘉三段完鉆,獲得少量的油氣地質(zhì)資料。緊鄰的川東、川東北地區(qū)大規(guī)模的礁灘相儲層及國內(nèi)最大的海相氣田——普光氣田的發(fā)現(xiàn),預(yù)示著基本處于同一沉積與構(gòu)造背景的川西地區(qū)二疊-中三疊統(tǒng)具有巨大的油氣勘探潛力。在該區(qū)獲得的油氣儲量大都集中在川西坳陷周圍,而在坳陷內(nèi)部發(fā)現(xiàn)卻較少,究竟是運移的影響,還是受沉積相控制,現(xiàn)今,人們對斷裂的研究已經(jīng)比較成熟,所以有必要對全區(qū)的沉積相進行系統(tǒng)的研究,以便重建古地理,恢復(fù)古環(huán)境,指導(dǎo)該區(qū)今后的油氣勘探。本文采用層序地層學(xué)理論,緊密結(jié)合地震、鉆井和野外露頭資料,以Ⅲ級層序及其體系域為重點,對川西坳陷中段地區(qū)下三疊統(tǒng)嘉陵江組地層進行了層序劃分,共劃分出1個Ⅱ級層序、2個Ⅲ級層序(SQ1,SQ2)、4個體系域,并對各個體系域進行了詳細描述；在Ⅲ級層序的基礎(chǔ)上,進行了鉆井、露頭以及主要地震剖面的橫向?qū)有驅(qū)Ρ?建立了該地區(qū)的層序地層格架,并重點選擇測線進行了地震相研究,以Ⅲ級層序及體系域為編圖單元,參考地震反射波的外部形態(tài)、內(nèi)部構(gòu)型和物理參數(shù)等編圖要素,分別編制了嘉陵江組嘉一、嘉二、嘉三、嘉四+嘉五段四個時期的巖相古地理圖以及嘉陵江組地震相平面分布圖。在此基礎(chǔ)上,利用鉆井和露頭資料進行約束,將地震相和沉積相進行匹配轉(zhuǎn)換,編制了四個時期的沉積相圖,認為該區(qū)下三疊世嘉陵江期有利沉積相主要為臺地邊緣高能灘相,嘉二、三段顆粒白云巖儲層發(fā)育,為有利的儲集相帶。結(jié)合成藏組合條件,指出有利區(qū)帶。建議今后在該地區(qū)進行精細的地震地質(zhì)及層序地層沉積相研究,為海相深層油氣勘探打開良好局面。
[Abstract]:The middle segment of the western Sichuan depression is located in the western Sichuan plain of Sichuan Basin, which belongs to the western Sichuan depression and covers an area of about 8,000 km2. The oil and gas exploration in this area in recent decades has mainly concentrated on the Meso-Cenozoic continental strata, and has achieved good oil and gas exploration results. However, the degree of marine oil and gas exploration is very low. Only a few drilling wells have been drilled to marine strata, and Chuanke well 1 has been drilled to the third section of Jia-3 to obtain a small amount of oil and gas geological data. The discovery of large-scale reef and beach facies reservoirs in northeast Sichuan and the largest marine gas-Pu Guang gas field in China, It indicates that the Permian-Middle Triassic in the western Sichuan area has great potential for oil and gas exploration. Most of the oil and gas reserves obtained in this area are concentrated around the western Sichuan depression, but few are found in the inner depression. Whether migration affects or is controlled by sedimentary facies, nowadays, the study of faults has become more mature, so it is necessary to study the sedimentary facies of the whole area systematically in order to reconstruct paleogeography and restore paleoenvironment. In this paper, sequence stratigraphy theory is used to closely combine seismic, drilling and outcrop data, with emphasis on the order 鈪，

本文編號：1637640