本文選題：江陵凹陷 + 沉積體系��； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：江陵凹陷位于江漢盆地西南部。東鄰丫角-新溝低凸起,北以紀(jì)山寺斷層與河溶凹陷、遠(yuǎn)安凹陷、荊門(mén)地塹相隔,南部東段超覆在華容隆起之上,西段與湖南洞庭盆地相通,西部北段以問(wèn)安寺斷層為界與枝江凹陷相鄰,南段超復(fù)在中古生界宜都-鶴峰背斜帶和桑植-石門(mén)復(fù)向斜之上,是江漢盆地最大的白堊-古近系沉積凹陷,面積達(dá)6500km2。目前,江陵凹陷勘探程度較低,資源量發(fā)現(xiàn)率低,具有巨大的勘探潛力；同時(shí),江陵凹陷新溝嘴組又是一個(gè)碎屑與蒸發(fā)混合沉積的凹陷,油、鹽共生；荊州背斜帶油氣發(fā)現(xiàn)豐富,隨著開(kāi)發(fā)的深入,原有的沉積微相的認(rèn)識(shí)與砂體連通性的認(rèn)識(shí)不能滿足生產(chǎn)的需要,因此在落實(shí)前人沉積體系展布研究成果上,深化荊州背斜帶沉積微相及砂體連通性的認(rèn)識(shí),為下一步滾動(dòng)開(kāi)發(fā)提供依據(jù)。本文通過(guò)巖心錄井資料,通過(guò)巖心觀察與描述,查明巖電關(guān)系,完成巖心相分析；查明從碎屑沉積到化學(xué)沉積的沉積相類型,建立測(cè)井相模式；利用測(cè)井相分析成果,通過(guò)測(cè)井相標(biāo)定,完成沉積相展布分析。通過(guò)相控,查明砂巖的展布,預(yù)測(cè)有利的巖性圈閉。主要得出以下結(jié)論。1、江陵凹陷砂巖粒度較細(xì),以粉砂為主,細(xì)砂次之,中粗砂不發(fā)育,不見(jiàn)礫。平均粒度曲線呈S形說(shuō)明碎屑粒度分布特征總體上為三角洲前緣河口沙壩之后到前三角洲之間的分流河道沉積類型。2、在測(cè)井相分析的基礎(chǔ)上,三角洲平原亞相主要發(fā)育分流河道、天然堤、決口扇微相。分流河道呈鐘型曲線或箱型+鐘型曲線特征,天然堤位于分流河道頂部,巖性為泥質(zhì)粉砂巖,曲鐘型曲線特征。決口扇微相位于三角洲平原亞相,呈漏斗型曲線特征。綜合暗色泥巖分布,蒸發(fā)巖分布,完成研究區(qū)小層沉積相圖7幅；認(rèn)為荊州北斜帶荊西油田以西,處于南荊水系分流河道前緣；八嶺油田及以東地區(qū),處于遠(yuǎn)安水系三角洲前緣分流河道區(qū)。3、在前人成果綜述的基礎(chǔ)上,通過(guò)重礦物分析、結(jié)合砂巖巖性、粒度分析,證實(shí)江陵凹陷新下段只發(fā)育北部遠(yuǎn)安水系和南荊水系兩個(gè)物源體系,遠(yuǎn)安水系分布于八嶺油田及以西地區(qū),南荊水系分布于花園油田、荊西油田及以東地區(qū)；發(fā)育于凹陷北部地區(qū)。4、通過(guò)巖心觀察,在巖心相圖和測(cè)井資料分析的基礎(chǔ)上,結(jié)合粒度資料,總結(jié)出研究區(qū)的主要沉積微相類型包括三角洲前緣分流河道,支流間灣；淺湖砂壩,淺湖泥；鹽湖等六類微相類型。5、江陵凹陷沉積體系總的特征有3方面：①北砂南膏泥、中部為暗色泥巖與鹽巖沉積區(qū)。②北砂受兩個(gè)水系控制,東為南荊水系,西為遠(yuǎn)安水系。③梅槐橋洼陷處于遠(yuǎn)安水系前緣,資福寺洼陷處于南荊水系前緣。主要發(fā)育河流三角洲沉積體系和湖盆蒸發(fā)巖體系兩類沉積體系。6、在砂巖分布圖,構(gòu)造圖、測(cè)井解釋成果圖、試油成果圖迭合的基礎(chǔ)上,進(jìn)行了巖性圈閉分析與評(píng)價(jià),進(jìn)行有利區(qū)迭合,根據(jù)迭合程度高低,選取迭合層數(shù)在多層的有利區(qū),共選出2個(gè)最有利區(qū)。
[Abstract]:The Jiangling sag is located in the southwest of the Jianghan Basin. The east adjacent Ya Jiao - Xin Gou low uplift, the north of the Ji Shansi fault and the river dissolve depression, the Jingmen graben, the South East section overlying the Huarong uplift, the west section of the Hunan Dongting Basin, the border of the Q 'an temple adjacent to the Zhijiang sag, and the southern section over the Middle Paleozoic. The Yidu Hefeng anticline belt and the Sangzhi Shimen complex syncline are the largest Cretaceous Paleogene sedimentary sags in the Jianghan Basin. The area reaches 6500km2. at present, the exploration degree of Jiangling sag is low, the discovery rate of resources is low, and it has great exploration potential. At the same time, the Xin Gou mouth formation in Jiangling depression is also a depressions of detrital and evaporative mixed deposits, oil, The Jingzhou anticline belt is rich in oil and gas discovery. As the development deepens, the understanding of the original sedimentary microfacies and the understanding of the connectedness of the sand body can not meet the needs of the production. Therefore, the understanding of the sedimentary microfacies and the sand body connectivity of the Jingzhou anticline zone is deepened in the implementation of the previous research results of the predecessors' depositional system, providing the next rolling development. According to the data of core logging, through the observation and description of core, the relationship between rock and electricity is found out, the core phase analysis is completed, the types of sedimentary facies from clastic deposition to chemical deposition, the model of logging facies are established, and the results of logging facies analysis are used to determine the distribution of sedimentary facies through well logging, and the sandstone expansion is identified by phase control. The main conclusions are as follows:.1, the grain size of the sandstones in Jiangling depression is fine, mainly with silt and fine sand, the coarse sand is not developed, and the gravel is not developed. The average grain size curve shows S shape distribution characteristics of the debris granularity distribution, which is the distributary channel sedimentary type.2 between the delta front estuary sand dam and the former Delta. On the basis of log facies analysis, the subfacies of delta plain mainly develop distributary channel, natural dike and crevasse fan microfacies. The distributary channel is characterized by bell type curve or box type + bell type curve, the natural dike is located at the top of the distributary channel, the lithology is muddy siltstone, and the curve of the curved bell type curve is located in the delta plain subfacies and is funnel-shaped. The distribution of dark mudstone, the distribution of the evaporite and the distribution of the evaporite, completed the sedimentary facies map of the small layer of the study area 7. It is believed that the west of Jingxi oilfield in the north of Jingzhou is in the front of the distributary channel of the South jingling water system, and the eight ridge oil field and the East region are in the delta front distributary channel region.3 of the far safe water system, and on the basis of the previous achievements, the heavy minerals are passed through the heavy minerals. Based on the analysis of sandstone lithology and particle size analysis, it is proved that the new lower section of Jiangling sag developed only two source systems in the northern far and South Jing water system. The remote safety water system is distributed in the eight ridge and west areas. The South Jing water system is distributed in the garden Oilfield, Jingxi oilfield and the east area; it is bred in the northern area of the depression.4, through the core observation, the core is in the core. On the basis of the analysis of phase map and log data, the main sedimentary microfacies of the study area include delta front distributary channel, inter tributary Bay, shallow lake sand dam, shallow lake mud, Saline Lake and other six types of microfacies.5, and there are 3 aspects of the total characteristics of the Jiangling sag system: (1) the North Sand paste mud and the dark mudstone in the middle. The northern sand is controlled by two water systems, the East is the South Jing water system, and the west is the far safe water system. (3) the Meishan depression is in the front of the far safe water system, and the fufu Temple depression is in the front of the southern watery water system. The main development of the sedimentary system of the River Delta and the sedimentary system of the lake basin evaporite system,.6, is explained in sandstone distribution map, structure map and log. On the basis of the overlap of the oil test results, the lithologic traps are analyzed and evaluated, and the favorable areas overlap. According to the degree of overlap, the number of overlapping layers is selected in the multi-layer favorable areas, and 2 most favorable areas are selected.

【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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