本文選題：鹽池地區(qū) + 山1段—盒8段　； 參考：《西南石油大學》2015年博士論文

【摘要】：蘇里格氣田是中國近幾年來發(fā)現(xiàn)的大型氣田。但隨著該氣田的開發(fā),盆地的后備油氣資源接替區(qū)不足,而位于盆地西部的鹽池地區(qū)與蘇里格氣田相鄰,為新開辟的勘探區(qū)域。上古生界山西組山1段和石盒子組盒8段是鹽池地區(qū)和蘇里格地區(qū)的主力儲層,在產(chǎn)能上存在一定差異,本文結(jié)合多個學科領(lǐng)域的理論體系,采用多種分析測試手段并統(tǒng)計,對比研究鹽池地區(qū)上古生界山西組山1段以及下石盒子組盒8(上、下)段的沉積微相、儲層巖石學、孔喉微觀結(jié)構(gòu)、成巖作用類型、儲層物性和非均質(zhì)性特征,最終探討了儲層物性主控因素,并進行儲層綜合評價。鄂爾多斯盆地西部鹽池地區(qū)上古生界石盒子組和山西組物源來源一致,母巖主要為元古宇孔茲巖、TTG片麻巖,以及泥盆—石炭紀火山—巖漿活動產(chǎn)物。源區(qū)構(gòu)造背景為活動大陸邊緣、被動大陸邊緣和大陸島弧等同時存在的復雜構(gòu)造背景。主要物源方向分盆地西北緣的阿拉善古陸和盆地北緣的陰山古陸西段兩個方向,在鹽池—姬塬一帶形成混合物源區(qū),文章首次定義了混合物源區(qū)的形態(tài),即兩頭尖中間寬的“S”梭形。山1段發(fā)育曲流河三角洲沉積,具有完整的二元結(jié)構(gòu)；盒8段發(fā)育辮狀河三角洲沉積,以砂體疊置為特征。兩個層段均呈北西—南東向展布。鹽池地區(qū)砂巖儲層主要分布于發(fā)育辮狀河三角洲的盒8段,在發(fā)育曲流河三角洲的山1段也有砂巖分布,但發(fā)育層數(shù)明顯比盒8段少。山1段、盒8段的巖石類型大致相同,顆�？傮w分選中—好,磨圓次棱,但是仍然存在著一定的差別。盒8段的石英含量相比山1段更高,具有更高的成分成熟度和巖屑成熟度,抗壓實作用更強,從而保留了一定的原生孔隙。儲集空間以各種粒間孔、晶間孔、溶蝕孔等復合孔隙為主,裂縫發(fā)育較少或不發(fā)育。山1段儲層成分成熟度較低,巖性主要為石英砂巖、巖屑石英砂巖,巖屑含量較高,填隙物含量較高,常見高嶺石、水云母、碳酸鹽、硅質(zhì)；盒8段儲層成分成熟度高,以石英砂巖、巖屑石英砂巖為主,巖屑含量較低,原生孔隙較發(fā)育,填隙物含量較高,以高嶺石、水云母、硅質(zhì)為主。結(jié)合物性資料判斷,兩個層段均屬于特低孔、特低滲的孔隙型儲層。對研究區(qū)內(nèi)目的層段5塊樣品進行恒速壓汞測試,結(jié)果顯示樣品均屬中-大孔微細喉型,其中孔隙半徑的大小及分布形態(tài)對滲透率貢獻值較大。從CT掃描上看,樣品中有微裂縫存在,但延伸較短。成巖作用分建設(shè)性成巖作用和破壞性成巖作用兩種,主要類型有壓實與壓溶作用、膠結(jié)充填作用、交代蝕變作用和溶蝕作用等。成巖演化階段主要為晚成巖的B期至C期。但處于不同層位、區(qū)域、巖性等條件下砂巖所遭受的成巖作用的強度不一致。其中石英砂巖表現(xiàn)出弱-中等壓實、中等一強膠結(jié)、弱溶蝕的特征；而巖屑砂巖則表現(xiàn)為中一強度壓實、中等一強膠結(jié)、較強溶蝕的特征,巖屑石英砂巖的成巖作用強度介于二者之間。綜合考慮巖性、孔隙結(jié)構(gòu)、物性等各種因素,對鹽池地區(qū)山1、盒8段儲層的成巖作用劃分出4種類型的成巖相,列舉了典型井縱向上的主要成巖相,并在研究區(qū)內(nèi)勾畫出成巖相平面展布圖,為儲層的綜合評價提供依據(jù)。物源區(qū)母巖的性質(zhì)決定著研究區(qū)儲層的巖石類型及其成分成熟度,物源的構(gòu)造背景和來源方向影響著沉積砂體的空間展布,從而影響著沉積相帶的劃分。沉積作用控制了儲層的粒度、碎屑組分、砂體接觸方式,進一步影響到未成巖—早期成巖作用的強弱,是控制儲層物性的最主要因素。中—晚期的成巖作用則進一步強化了儲層物性非均質(zhì)性。因此,物源、沉積和成巖作用是評價研究區(qū)兩個層位儲層特征的主要參考因素。綜合考慮儲層的巖性、物性、孔隙結(jié)構(gòu)、毛管壓力曲線特征、成巖作用強度、成巖相類型及特征等方面因素,對研究區(qū)儲層進行綜合分類,由好到差分了四類儲層,并對研究區(qū)山1段、盒8段儲層進行了有利區(qū)篩選,繪制了研究區(qū)山1段、盒8下亞段及盒8上亞段的有利勘探區(qū)預測圖。
[Abstract]:The Sulige gas field is a large gas field found in China in recent years. But with the development of the gas field, the reserve oil and gas resource replacement area of the basin is insufficient, while the Yanchi area, located in the west of the basin, is adjacent to the Sulige gas field. It is a newly opened exploration area. The 1 section of the upper Paleozoic Shanxi group mountain and the Shihezi box box 8 section are the salt pool area and the Sulige area. The main reservoir of the region has certain difference in capacity. In this paper, the sedimentary microfacies of the upper Paleozoic Shanxi group Shan 1 section and the Lower Shihezi Group 8 (upper and lower) section of the upper Paleozoic in the Yanchi area are compared with the theoretical system of many disciplines, and the reservoir petrology, pore throat microstructure, diagenesis type and reservoir type are compared. In the Western Ordos Basin, the upper Paleozoic Shihezi Formation in the Western Ordos Basin is the same as the source source of the Shanxi formation. The parent rock is mainly the Proterozoic oryds, TTG gneiss, and the Devonian Carboniferous volcanic magmatic products. The background is the complex tectonic setting of the active continental margin, the passive continental margin and the continental island arc. The main source direction is divided into two directions of the Alashan paleo land of the northwest margin of the basin and the western section of the Yinshan ancient land in the northern margin of the basin. The mixture source area is formed in the Yanchi Jiyuan area. The form of the mixture source area is first defined. The "S" shuttle shape in the middle of the two ends is wide. The 1 section of the River Delta is deposited in the 1 section of the mountain, with a complete two element structure; the 8 section of the braided river delta is developed in the box, and the sand body is stacked as the feature. The two layers are both northwestern and southward. The sandstone reservoirs in the salt pool area are mainly distributed in 8 sections of the braided river delta. The 1 section of the mountain of the River Delta also has sandstone distribution, but the number of development layers is obviously less than that of the box 8. The 1 section of the mountain is roughly the same type of rock in the 8 section of the box. The grain is generally selected - good and grinding round, but there is still a certain difference. The content of quartz in the 8 section of the box is higher than the 1 section of the mountain, and has a higher degree of maturity and cuttings maturity and anti compaction. The reservoir space is dominated by a variety of intergranular pores, intergranular pores, and dissolution pores, and the fractures are less developed or not developed. The reservoir composition of the 1 section of mountain is low, and the lithology is mainly quartz sandstone, lithic quartz sandstone, high content of rock debris, high content of fillings, common kaolinite and water cloud. Mother, carbonate and siliceous; the 8 section of the box has high maturity, mainly quartz sandstone, lithic quartzite, low content of cuttings, primary pore, high filling material, kaolinite, water mica and siliceous material. The two layers belong to ultra-low pore and ultra-low permeability pore type reservoir. 5 samples of the layer are tested at constant speed, and the results show that the samples belong to the medium pore microlarynx, and the size of the pore radius and the distribution pattern contribute to the permeability. From the CT scan, there are micro cracks in the samples, but the extension is short. The diagenesis is divided into two kinds, the constructive diagenesis and the destructive diagenesis. There are compaction and pressure dissolution, cementing filling, metasomatism and alteration and dissolution. The evolution stage of the diagenesis is mainly the B period of late diagenesis to C period, but the diagenesis of sandstone under the conditions of different beds, regions and lithology is not consistent. While lithic sandstone is characterized by medium strength compaction, medium strong cementation and strong dissolution, the diagenesis of lithic sandstone is between two. Lithology, pore structure and physical properties are considered comprehensively, and 4 types of diagenesis are divided into the diagenesis of the 1 and the 8 section of the reservoir in the Yanchi area. The main diagenetic facies in the longitudinal direction of the typical wells are enumerated, and the diagenetic map of the diagenetic facies is outlined in the study area, which provides the basis for the comprehensive evaluation of the reservoir. The nature of the parent rock in the source area determines the rock type and the maturity of the reservoir in the study area, and the tectonic setting and source direction of the source source affect the spatial distribution of the sedimentary sand body. It affects the division of sedimentary facies, which controls the granularity of the reservoir, detrital components, and the contact mode of sand body, which further affects the strength of the undiagenetic and early diagenesis, and is the most important factor in controlling the physical property of the reservoir. Rock interaction is the main reference factor to evaluate the reservoir characteristics of the two layers in the study area. Considering the lithology, physical property, pore structure, capillary pressure curve, diagenesis strength, diagenetic facies and characteristics, the reservoir is classified into four types of reservoirs, 1 sections of the study area, and the case of the 1 section of the study area. In the 8 section, the favorable area was screened, and the prediction map of favorable exploration area for the 1 segment of the mountain, the lower part of the box 8 and the upper part of the box 8 were plotted.

【學位授予單位】：西南石油大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：P618.13
，

本文編號：1775100