【摘要】：鄂爾多斯盆地東南部延安氣田延513-延183井區(qū)上古生界主力氣層為山西組。本文以沉積學、儲層地質(zhì)學為指導,在對巖心、薄片、粒度、陰極發(fā)光、掃描電鏡、物性、試氣等地質(zhì)資料詳細分析的基礎上,結合測井等物探資料,對研究區(qū)山西組山1段和山2儲層特征進行了綜合分析研究,在此基礎上搞清了優(yōu)質(zhì)儲層發(fā)育的主控因素,明確了研究區(qū)主要儲層類型及其對氣藏形成與分布的控制作用。延安氣田延513-延183井區(qū)山1、山2段沉積相為曲流河三角洲前緣亞相,其微相又分為水下分流河道、河口壩和水下分流間灣。儲層的巖石類型以巖屑石英砂巖、巖屑砂巖為主,石英砂巖次之,填隙物成分主要有泥質(zhì)雜基、高嶺石、含鐵方解石以及硅質(zhì)等。山1、山2儲層孔隙度分別為4.94%、5.65%,滲透率分別為0.67mD、2.53mD,孔隙類型主要以溶蝕孔、粒間殘余孔隙為主,還有一些微裂縫發(fā)育。綜合沉積相、儲層特征、孔隙結構、成巖作用、物性特征和試氣結果等儲層各方面因素的特征,將研究區(qū)分為四類儲層,Ⅰ類為有利的儲層,Ⅱ類為較有利儲層,Ⅲ類為中等儲層,Ⅳ類為差的儲層。研究認為發(fā)育在曲流三角洲前緣砂體,粒度以中粗、粗粒為主,石英含量較高,孔隙度與滲透率相對較高,有利于發(fā)育優(yōu)質(zhì)儲層。山1、山2段氣藏的展布受儲層砂體展布的控制,砂體單層厚度3m,砂層段巖性穩(wěn)定,氣藏發(fā)育;研究區(qū)山西組儲層成巖作用階段已達到晚期,儲層的孔滲性嚴重降低,巖性圈閉條件更為復雜,在同一相帶控制的砂體相對較發(fā)育的地區(qū),成巖后期中相對發(fā)育建設性成巖作用(溶蝕作用),儲層有效儲集能力明顯增大,天然氣相對富集。
[Abstract]:The main upper Paleozoic gas reservoir of Yan'an gas field in the southeast of Ordos basin is Shanxi formation. Guided by sedimentology and reservoir geology, on the basis of detailed analysis of geological data, such as core, thin slice, grain size, cathodoluminescence, scanning electron microscope, physical properties and gas test, and combined with geophysical prospecting data such as well logging, Based on the comprehensive analysis and research on the reservoir characteristics of Shan-1 and Shan-2 reservoirs in Shanxi formation, the main controlling factors for the development of high-quality reservoirs are clarified, and the main reservoir types and their controlling effects on the formation and distribution of gas reservoirs in the study area are clarified. The sedimentary facies of Yan513-Yan183 well area in Yan'an gas field is subfacies of meandering river delta front, and its microfacies are divided into underwater distributary channel, estuary dam and underwater distributary bay. The rock types of reservoir are lithic quartz sandstone, lithic sandstone and quartz sandstone, and the composition of filling material is mainly argillaceous complex, kaolinite, iron-bearing calcite and siliceous, etc. The porosity and permeability of Shan-1 and Shan-2 reservoirs are 4.94%, 5.65%, 0.67mD and 2.53mD, respectively. The pore types are mainly solution pores, intergranular residual pores and some micro-fractures. Based on the characteristics of sedimentary facies, reservoir characteristics, pore structure, diagenesis, physical properties and gas test results, the study is divided into four types of reservoirs, type I is favorable reservoir and type 鈪，

本文編號：2457423