本文選題：儲(chǔ)層特征 + 主控因素��； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：川西坳陷侏羅系上統(tǒng)蓬萊鎮(zhèn)組致密-常規(guī)砂巖儲(chǔ)層是我國(guó)重要的天然氣儲(chǔ)集層和四川盆地中淺層天然氣重點(diǎn)開發(fā)層位。什邡-德陽-廣金地區(qū)位于川西坳陷中段北部斜坡帶上,是川西地區(qū)上侏羅統(tǒng)油氣開發(fā)及下一步勘探部署的重點(diǎn)層段。該區(qū)普遍經(jīng)歷了較為復(fù)雜的成巖演化過程,特別是強(qiáng)烈的膠結(jié)作用嚴(yán)重破壞儲(chǔ)層物性,造成儲(chǔ)層近致密-致密的特點(diǎn)。因此,本論文針對(duì)儲(chǔ)集層致密化的特點(diǎn),以沉積學(xué)、沉積巖石學(xué)、沉積相、測(cè)井地質(zhì)學(xué)、儲(chǔ)層地質(zhì)學(xué)、石油與天然氣地質(zhì)學(xué)等相關(guān)理論為指導(dǎo)思想,充分利用研究區(qū)豐富的物性、薄片、巖心、測(cè)井、試氣資料對(duì)控制該區(qū)優(yōu)勢(shì)沉積相帶展布、優(yōu)勢(shì)成巖帶展布、優(yōu)勢(shì)儲(chǔ)層發(fā)育的主控因素等進(jìn)行深入分析并預(yù)測(cè)有利區(qū)分布。研究區(qū)蓬萊鎮(zhèn)組砂巖儲(chǔ)集層主要是辮狀河三角洲沉積,蓬一段主體為三角洲前緣亞相沉積,局部為前三角洲亞相沉積,三角洲前緣亞相分流河道砂厚小,但疊置程度較高,主要分布在JP42、JP43砂組中；蓬二段、蓬三段、蓬四段均為三角洲平原亞相沉積,其中蓬二段、蓬四段為遠(yuǎn)岸三角洲平原沉積,分流河道砂體厚度厚,主要分布在JP13、JP15、JP37、JP38、Jp39砂組中,蓬三段為近岸三角洲平原沉積,分流河道砂體厚度較大,疊置程度也較高,主要分布在JP23、JP25砂組中。蓬萊鎮(zhèn)組廣泛發(fā)育的三角洲平原水上分流河道、三角洲前緣水下分流河道及河口砂壩沉積,砂巖縱向多層疊置、平面連續(xù)分布,儲(chǔ)層物性條件良好,具備良好的沉積相帶。研究區(qū)蓬萊鎮(zhèn)組主要發(fā)育巖屑砂巖、巖屑質(zhì)石英砂巖。蓬一段以粉砂巖為主,蓬二段、蓬三段、蓬四段巖性以細(xì)砂巖、粉細(xì)砂巖為主,在相對(duì)較強(qiáng)水動(dòng)力條件下分選較好；研究區(qū)儲(chǔ)層埋深普遍在1500-1800m,顆粒間以線接觸為主,壓實(shí)程度中等-強(qiáng)。研究區(qū)地層整體處于中成巖A階段,經(jīng)歷了較長(zhǎng)的膠結(jié)作用；研究區(qū)主要以孔隙膠結(jié)為主,發(fā)育泥質(zhì)、硅質(zhì)、碳酸鹽膠結(jié)類型,其中早期泥質(zhì)膠結(jié)以片狀、絲狀自生伊利石及“蜂窩狀”伊蒙混層為主,硅質(zhì)膠結(jié)以自生石英產(chǎn)出及石英次生加大為主,早期碳酸鹽膠結(jié)以方解石膠結(jié)為主,晚期碳酸鹽膠結(jié)以含鐵方解石膠結(jié)為主；研究區(qū)儲(chǔ)集層在經(jīng)歷了復(fù)雜的膠結(jié)作用后,儲(chǔ)集層孔隙性,滲透性降低,儲(chǔ)集層孔隙類型以次生溶蝕孔隙為主,喉道類型以片狀、彎片狀喉道及微喉道為主。通過成巖相測(cè)井分析,建立全區(qū)非取心井測(cè)井成巖相分析,運(yùn)用地質(zhì)建模手段,分析研究區(qū)優(yōu)勢(shì)成巖相帶展布特征。研究區(qū)主要發(fā)育溶蝕孔隙成巖相、斑狀溶蝕孔隙成巖相、致密膠結(jié)成巖相及致密壓實(shí)成巖相,其中主力產(chǎn)層儲(chǔ)層成巖相總體為溶蝕孔隙成巖相、斑狀溶蝕孔隙成巖相,致密膠結(jié)成巖相,致密壓實(shí)成巖相儲(chǔ)層產(chǎn)能很差,基本不能形成工業(yè)氣藏。通過對(duì)沉積、成巖不同因素對(duì)儲(chǔ)集層物性的控制分析發(fā)現(xiàn)：優(yōu)勢(shì)沉積相帶是良好儲(chǔ)層物性發(fā)育的基礎(chǔ),有利成巖相帶是良好儲(chǔ)層物性發(fā)育的關(guān)鍵,但對(duì)于有利區(qū)預(yù)測(cè)還需要考慮氣藏成藏特征及其有利地質(zhì)因素。研究區(qū)區(qū)什邡-德陽-廣金地區(qū)總體上構(gòu)造較為單一,整體呈北東高、西南低的凹陷、斜坡構(gòu)造,構(gòu)造埋深落差近1000米,在研究區(qū)西南部的馬井地區(qū)烴源斷層及淺層次級(jí)斷層及裂縫系統(tǒng)發(fā)育,烴源充足,較大的源儲(chǔ)壓差導(dǎo)致天然氣可以運(yùn)移進(jìn)入儲(chǔ)滲性相對(duì)較差儲(chǔ)層,從蓬一段到蓬四段均能成藏。什邡地區(qū)盡管烴源斷層欠發(fā)育,但其相對(duì)馬井烴源斷層,在主要成藏期和現(xiàn)今均位于構(gòu)造較高位置；德陽、廣金地區(qū)主要在研究區(qū)邊部靠近斷裂帶及優(yōu)勢(shì)沉積相帶部位有較好的油氣顯示。根據(jù)研究區(qū)“三元”控藏特點(diǎn),結(jié)合優(yōu)勢(shì)沉積相帶、成巖相帶等綜合評(píng)價(jià),確定研究區(qū)有利區(qū)在蓬一段、蓬二段主要分布在研究區(qū)西南部靠近馬井區(qū)塊附近及什邡地區(qū)內(nèi)部高構(gòu)造部位,在蓬三段、蓬四段主要分布在馬井區(qū)塊及研究區(qū)北東部德陽區(qū)塊及廣金區(qū)塊。
[Abstract]:The dense conventional sandstone reservoir of the upper Jurassic Penglai formation in the West Sichuan depression is an important natural gas reservoir in China and a key layer of natural gas in the middle and shallow layers of the Sichuan basin. The Shifang Deyang - Guang Jin area is located on the northern slope of the middle part of the Western Sichuan Depression. It is the key section of the oil and gas development and the next exploration deployment in the upper Jurassic in Western Sichuan. This area has generally experienced more complicated diagenetic evolution process, especially strong cementation, which seriously damaged reservoir physical properties and resulted in the near compact and compact reservoir characteristics. Therefore, this paper is based on the characteristics of reservoir densification, sedimentology, sedimentary petrology, sedimentary facies, well geology, reservoir geology, petroleum and natural gas geology. In order to guide the theory and make full use of the abundant physical property, thin film, core, logging and test gas data, the distribution of dominant sedimentary facies, dominant diagenetic belt distribution, dominant reservoir development and the distribution of dominant reservoir development are analyzed and predicted in the study area. The sandstone reservoir of Penglai town group in the study area is mainly the braided river three The main body is delta front subfacies deposit, part of delta front subfacies deposit, part of delta front delta subfacies deposit, delta front subfacies distributary channel sand thickness, but high degree of superposition, mainly distributed in JP42, JP43 sand group; the two pieces of Peng, Peng three and Peng four are all delta plain subfacies, of which the two section of the Peng and the four section of the Peng is the far shore triangle. The sand body thickness of the distributary channel is thick, mainly distributed in the JP13, JP15, JP37, JP38, Jp39 sand groups. The three section of the fluvial river is near shore delta plain, the distributary channel sand body is thick and the superposition is high, mainly in the JP23, JP25 sand group. The Delta plain water distributary channel is widely developed in the Penglai Town, the delta front edge water. The lower distributary channel and the estuarine sand dam deposit, the sandstone longitudinal multilayer superposition, the plane continuous distribution, the reservoir physical property condition is good, has the good sedimentary facies belt. The Penglai town group of the study area mainly develops lithartstone, lithic quartz sandstone. The Peng first section is mainly siltstone, two pieces of Peng, Peng three section, and the lithology of the four pieces of the Peng is mainly fine sandstone and fine sandstone. Well separation is better under relatively strong hydrodynamic conditions; the depth of reservoir in the study area is generally in 1500-1800m, the main particles are line contact and the degree of compaction is medium strong. The study area is in the A stage of the middle diagenesis, and has experienced a long cementation; the main area in the study area is the pore cementation, and the clay, siliceous and carbonate cementation types are developed. The early early muddy cementation is flaky, filamentous authigenic illite and "honeycomb" imimon, with siliceous cementation mainly composed of authigenic quartz and quartz secondary, early carbonate cementation mainly calcite cementation and late carbonate cementation with iron calcite cementation, and complex cementation in the study area. After use, the reservoir porosity and permeability decrease, the reservoir pore type is dominated by secondary dissolution pores, and the laryngeal tract type is mainly flake, curved lamellar throat and micro throat. Through the analysis of lithofacies log analysis, the analysis of well logging diagenesis in the whole area is established, and the geological modeling means are used to analyze the distribution characteristics of the dominant lithofacies zone in the study area. In the area, there are mainly dissolved pore diagenetic facies, porphyritic corrosion pore forming facies, dense cemented lithofacies and compact compaction diagenetic facies, of which the main reservoir diagenetic facies are generally dissolved pore diagenetic facies, porphyritic pore diagenetic facies, dense cemented diagenetic facies, compact compaction diagenetic reservoir capacity is very poor, and basically can not form industrial gas reservoirs. The control analysis of the reservoir physical properties of different factors of diagenesis shows that the dominant sedimentary facies belt is the basis of the physical property development of the good reservoir, and the favorable lithofacies zone is the key to the physical property development of the good reservoir, but the reservoir characteristics and the geological factors should be considered for the favorable area prediction. The study area of Shifang - Deyang - Guang Jin area The overall structure is relatively simple, the whole is North East high, the southwest low depression, the slope structure, the tectonic buried depth difference nearly 1000 meters. In the southwest of the study area, the hydrocarbon source fault and the shallow secondary fault and fracture system are developed, the hydrocarbon source is sufficient, the large source reservoir pressure difference causes the natural gas to move into the reservoir permeability relatively poor reservoir. In spite of the less developed hydrocarbon source faults in the Shifang area, the relative Malayan source fault in Shifang area is located at a higher position in the main reservoir formation period and today, while Deyang, the Guangzhou gold area is mainly located near the fault zone and the dominant sedimentary facies zone in the area of the study area, according to the study area "three". The characteristics of the "Yuan" reservoir control, combined with the dominant sedimentary facies belts and diagenetic facies belts, confirm that the favorable area of the study area is in the Pengyi section. The two Pengu section mainly distributes in the southwest of the study area near the block of Ma well and the high tectonic parts of the Shifang area. In the Pengshan three section, the pengpeng four section is mainly distributed in the block of Ma well and the Deyang block in the north east of the study area. Guang Jin block.

【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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