【摘要】：新溝油田位于江漢盆地潛江凹陷南部地區(qū),靠近總口向斜南部的繼承性古斜坡上的新溝斷壘帶內(nèi),新溝咀組下段為江漢盆地的主要含油氣層之一,凹陷南部具有較大勘探潛力,但針對其區(qū)域基礎(chǔ)地質(zhì)研究、巖性巖相展布規(guī)律、儲層特征及分布規(guī)律、有利儲層空間預(yù)測、油氣成藏主控因素及富集規(guī)律等方面的認(rèn)識還不夠系統(tǒng)和深入,特別是對南部地區(qū)的致密油富集規(guī)律的認(rèn)識還不足,嚴(yán)重影響和制約了南部地區(qū)的勘探步伐。本論文主要是以石油地質(zhì)學(xué),油藏描述、儲層地質(zhì)學(xué)的理論方法為指導(dǎo),以新溝咀組新下Ⅱ油組為研究對象,以巖心資料、測井資料、錄井資料、分析化驗(yàn)資料、地震解釋、生產(chǎn)測試資料為依據(jù),綜合利用各種研究方法以及結(jié)合前人的研究成果對新溝地區(qū)新下Ⅱ油組開展沉積相研究、儲層特征及控制因素研究、烴源巖分布特征及油源對比研究。根據(jù)這些研究結(jié)論系統(tǒng)分析研究區(qū)油藏類型及特征、新下Ⅱ油組油氣有利富集相帶、油氣儲層的展布,從而預(yù)測有利儲層及油氣富集規(guī)律,為油田下一步勘探部署提供理論依據(jù)。通過系統(tǒng)研究主要取得了以下幾點(diǎn)認(rèn)識：1.新下Ⅱ油組以淺湖泥質(zhì)白云巖坳陷期沉積特征為主,是致密油藏形成的有利層段。研究區(qū)碳酸鹽巖的沉積是受古地貌控制,巖性特征主要表現(xiàn)為厚層泥巖夾薄層泥晶白云巖和中層灰黃色泥晶白云巖與薄層深灰色泥巖呈不等厚互層或中層白云巖與中層泥巖等厚互層。本區(qū)不等厚互層是這種地勢相對較高區(qū)域的巖性所表現(xiàn)出來主要特征；而沉積厚度介于前兩者之間的過渡區(qū)域,即古地形上的高部位與低洼之間的過渡區(qū)域,白云巖含量較高,主要表現(xiàn)為厚層灰黃色泥晶白云巖夾薄層深灰色泥巖。2.根據(jù)新溝地區(qū)4口全井段取芯井的巖心、薄片仔細(xì)觀察以及全區(qū)200多口探井的鉆井資料分析,確定了研究區(qū)沉積相的類型為淺湖沉積相類型,其中亞相為湖坪、淺湖砂壩和局限洼地,湖坪分為泥坪和云坪兩個微相,局限洼地劃分為泥質(zhì)洼地和云質(zhì)洼地兩種微相類型。3.研究區(qū)主要是白云巖儲層,主要的巖石類型包括：泥晶白云巖、泥頁巖、白云質(zhì)泥巖、泥質(zhì)白云巖、泥膏巖、膏質(zhì)泥巖、粉砂巖共七種巖性。儲層的孔隙類型主要有原生孔隙、次生孔隙、裂縫。孔隙類型以晶間孔隙發(fā)育為主。通過對普通薄片,陰極發(fā)光片及掃描電鏡鑒定發(fā)現(xiàn),研究區(qū)新下Ⅱ油組碳酸鹽巖儲層為中孔-特低滲儲。4.儲層控制因素的綜合分析認(rèn)為,沉積環(huán)境和沉積相是碳酸鹽巖儲層發(fā)育的主要控制因素,成巖作用對儲層既有破壞作用又有促進(jìn)作用、膠結(jié)作用和溶蝕作用類型。壓實(shí)作用和白云石化作用降低儲層的孔隙度和滲透率。溶蝕作用對儲層孔隙有改善作用,提高儲集物性。5.研究區(qū)烴源巖有機(jī)質(zhì)豐度整體較高,有機(jī)質(zhì)類型以Ⅱ2型為主,烴源巖熱演化程度整體較低,新下Ⅱ油組主體處于低成熟熱演化階段。油源對比分析表明新溝地區(qū)新下Ⅱ油組原油為低熟原油,來源于本層段中下部低成熟的烴源巖,而與老新油田和拖市油田原油有較大差別。研究區(qū)NE部靠近總口向斜方向,烴源巖成熟度相對較高,所生成的油氣可以通過斷層和高滲透層組成的輸導(dǎo)體系運(yùn)聚到構(gòu)造高部位成藏。6.通過典型油藏解剖認(rèn)為在研究區(qū)EN部構(gòu)造相對低部位,油氣主要是源儲直接對接或鄰近的非常規(guī)油氣成藏模式。在研究區(qū)中部構(gòu)造高點(diǎn)地區(qū),屬于常規(guī)的二次運(yùn)移成藏模式。而在研究區(qū)南部地區(qū)成藏概率較小。
[Abstract]:The Xin Gou oil field is located in the southern part of the Qianjiang sag of the Jianghan Basin, near the new furrow fault zone on the inherited paleo slope of the southern part of the general estuary. The lower section of the Xin Gou Tsui formation is one of the main oil and gas bearing strata in the Jianghan Basin, and the south of the sag has a great exploration potential, but the lithologic facies distribution law and reservoir characteristics for its regional basic geological study. The understanding of the distribution law, the favorable reservoir space prediction, the main controlling factors and the enrichment law of the oil and gas accumulation is not systematic and deep, especially the understanding of the dense oil enrichment law in the south area is still insufficient, which seriously affects and restricts the exploration step in the southern region. This paper mainly is petroleum geology, reservoir description and reservoir. Based on the theory and method of geology, taking the new oil group of Xin Gou Tsui group as the research object, based on core data, logging data, logging data, analysis and laboratory data, seismic interpretation, and production test data, the study on the sedimentary facies of the new second oil group in the Xin gou area is carried out synthetically by using various research methods and combining the previous research results. Research on reservoir characteristics and control factors, distribution characteristics of hydrocarbon source rocks and oil source contrast research. According to these conclusions, the reservoir types and characteristics are systematically analyzed, and the favorable enrichment phase and distribution of oil and gas reservoirs in the new lower oil group are used to predict the favorable reservoir and oil and gas accumulation rules, providing theoretical basis for the next exploration and deployment of the oil field. According to the systematic study, the following understandings have been obtained: 1. the sedimentary characteristics of the new lower oil group are mainly in the shallow lake muddy dolomite depression period, which are favorable layers for the formation of dense reservoirs. The sedimentary carbonate rocks in the study area are controlled by the ancient geomorphology, and the lithologic characteristics are mainly characterized by the thick mudstone sandwiched with thin muddy dolomite and the middle layer of gray yellow. The interbedded interbeds between the mudstone dolomite and the thin layer of the deep gray mudstone are interbedded with the middle layer of dolomite and middle mudstone. The unequal thickness in this area is the main characteristic of the lithology of the relatively high terrain, and the sedimentary thickness is in the transitional region between the former two, that is, the transition between the high part of the palaeotopography and the low depression. Area, the content of dolomite is high, mainly characterized by thick layer of gray yellowish mudstone with thin layer of deep gray mudstone.2., according to the core of the core well in 4 full well section of the Xin Gou area, carefully observed and analyzed by the drilling data of more than 200 exploration wells in the whole area, the type of sedimentary facies in the study area is a shallow lake sedimentary facies type, of which the subfacies is the lake. Ping, shallow lake sand dams and limited depressions are divided into two microfacies of mud flat and Yunping. The limited low-lying land is divided into muddy and cloud lying two types of microfacies.3. research area mainly dolomite reservoir. The main rock types include muddy dolomite, shale, dolomitic mudstone, muddy dolomite, mud paste rock, plaster mudstone, siltstone. There are seven types of lithology. The main pore types are primary pores, secondary pores and cracks. The main pore types are intergranular pore development. Through the identification of common thin slices, cathodoluminescence films and scanning electron microscopy, the carbonate reservoir of the new lower oil group in the study area is a comprehensive analysis of the control factors of the mesoporous and ultra-low permeability reservoir.4. reservoir. The facies and sedimentary facies are the main controlling factors for the development of carbonate reservoirs. The diagenesis has both destructive and promoting effects on the reservoir, cementation and corrosion types. Compaction and dolomitization reduce the porosity and permeability of the reservoir. The dissolution effect improves the pore space of the reservoir and improves the reservoir physical.5. research area. The organic matter abundance of the source rocks is higher, the type of organic matter is mainly type II 2, the thermal evolution of the source rocks is low, the main body of the hydrocarbon source rocks is in the low mature thermal evolution stage. The oil source comparison analysis shows that the new lower oil group of the new lower oil group in the new Valley is low mature crude oil, which is derived from the low mature source rock in the middle and lower part of the section, and it is with the old new oil field. In the study area, the NE part of the study area is close to the general syncline, and the maturity of the source rocks is relatively high. The generated oil and gas can be transported through the transport system composed of faults and high osmosis layers to the high part of the reservoir to form a reservoir of.6., which is considered to be relatively low in the EN part of the study area and the oil and gas are the main source. In the middle of the study area, the high point area in the middle of the study area belongs to the conventional two migration model, but the probability of accumulation is small in the southern part of the study area.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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