本文選題：鄂爾多斯盆地　切入點(diǎn)：富縣探區(qū)　出處：《西北大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：綜合巖心觀察、薄片分析、掃描電鏡、高壓壓汞、微米CT等分析測試資料,系統(tǒng)研究了鄂爾多斯盆地富縣探區(qū)延長組長8致密儲層沉積類型、儲層特征、儲層成巖作用及致密化過程,詳細(xì)分析了生油層特征及致密油特征,并指出下一步勘探方向及有利區(qū)。取得以下主要認(rèn)識與結(jié)論：富縣探區(qū)延長組長8儲層的物源來自于北東方向,其沉積相主要為三角洲前緣亞相中的水下分流河道微相和分流間灣微相；長82時期主要為水下分流河道砂體和水下分流間灣砂體,長81時期逐漸演變?yōu)樗路至骱拥郎绑w與泥巖互層,垂向上具有湖侵砂退的旋回特征。長8儲層砂巖碎屑成分具有“高長石端元、較低石英端元”的特點(diǎn),填隙物主要為方解石和伊利石。儲層孔隙度平均為8.0%,滲透率平均為0.26mD,為典型的致密砂巖儲層,孔隙主要發(fā)育粒間孔隙、原生粒間孔和粒內(nèi)、粒間溶孔及長石溶孔�？紫督Y(jié)構(gòu)特征復(fù)雜且分布不均,主要以亞微米級孔喉和少量的納米級孔喉系統(tǒng)為主。長8儲層成巖作用強(qiáng)烈,普遍已進(jìn)入中成巖階段A期,其成巖作用主要有壓實(shí)作用、膠結(jié)作用和溶蝕作用等。泥質(zhì)巖屑、黑云母碎屑等塑性組分是砂巖致密化的基礎(chǔ),強(qiáng)烈的壓實(shí)作用及碳酸鹽礦物膠結(jié)作用是砂巖致密化的關(guān)鍵,長石和一些易溶巖屑形成的次生孔隙改善了儲層的物性,致使一部分致密砂巖形成致密油儲層。儲層物性受埋深、巖性、沉積相、碳酸鹽膠結(jié)物的共同影響。據(jù)此,結(jié)合高壓壓汞參數(shù)將長8儲層分為4種類型：Ⅰ類為優(yōu)質(zhì)儲層,Ⅱ類為中等儲層,Ⅲ類為差儲層,Ⅳ類為非儲層。其中Ⅱ類儲層為油儲量、產(chǎn)量的主要貢獻(xiàn)者。地化參數(shù)表明,研究區(qū)長8致密油層廣覆式分布成熟優(yōu)質(zhì)生油層,生油層與儲層共生,無明顯圈閉界限。油氣聚集帶主要分布在水下分流河道的砂體厚度大、儲層孔隙結(jié)構(gòu)好的區(qū)帶,據(jù)此預(yù)測Ⅰ類“甜點(diǎn)區(qū)”4個,Ⅱ類“甜點(diǎn)區(qū)”7個。
[Abstract]:Based on core observation, thin slice analysis, scanning electron microscope, high pressure mercury injection, micron CT and other data, the sedimentary types and reservoir characteristics of Chang 8 dense reservoir in Fuxian exploration area, Ordos Basin, are systematically studied. The diagenesis and densification process of reservoir are analyzed in detail. It also points out the next exploration direction and favorable area. The main conclusions are as follows: the material source of Yanchang No. 8 reservoir in Fuxian exploration area comes from the north-eastern direction, The sedimentary facies are mainly subaqueous distributary channel microfacies and interdistributary bay microfacies in delta front facies, while in Chang82 period, they are mainly underwater distributary channel sand body and underwater distributary bay sand body. The Chang 81 period gradually evolved into an underwater distributary channel sand body and mudstone interbedded, with vertical transgressive sand regressive cycle characteristics. The sandstone clastic composition of Chang 8 reservoir has the characteristics of "high feldspar end member, lower quartz end member". The porosity of reservoir is 8. 0 and the average permeability is 0. 26 mD. it is a typical tight sandstone reservoir with intergranular pores, primary intergranular pores and intragranular pores, and the porosity is mainly composed of calcite and Illite. Intergranular dissolution pore and feldspar dissolution pore. The pore structure is complex and unevenly distributed, mainly composed of sub-micron pore throat and a small amount of nanometer pore throat system. The diagenesis of Chang 8 reservoir is so strong that it has generally entered the stage A of middle diagenesis. Its diagenesis mainly includes compaction, cementation and dissolution, etc. The plastic components such as shaly and biotite are the basis of sandstone densification, and strong compaction and carbonate mineral cementation are the key to the densification of sandstone. The secondary pores formed by feldspar and some easily soluble lithic cuttings improve the physical properties of the reservoir and result in the formation of dense oil reservoirs in part of the compact sandstone. The physical properties of the reservoir are affected jointly by the buried depth, lithology, sedimentary facies and carbonate cementation. The Chang 8 reservoir can be classified into four types according to high pressure mercury pressure parameters: type 鈪，

本文編號：1595163