【摘要】：孔雀河斜坡位于塔里木盆地東北部,是一個(gè)介于庫魯克塔格隆起和滿加爾坳陷之間,總體呈北東高南西低的過渡斜坡帶。區(qū)內(nèi)志留系土什布拉克組是一套致密砂巖儲(chǔ)層,盡管具有良好的天然氣顯示,但由于受到長期的構(gòu)造演化和多期構(gòu)造疊加的影響,地質(zhì)條件復(fù)雜,志留系地震資料整體反射品質(zhì)差,勘探難度較大,前人的研究主要集中在成藏方面,對于儲(chǔ)層方面的研究較為薄弱。本文通過對塔里木盆地孔雀河斜坡志留系土什布拉克組的沉積相、儲(chǔ)層特征、成巖作用、成巖演化序列等的研究,對土什布拉克組致密砂巖儲(chǔ)層進(jìn)行了分類評(píng)價(jià),并從沉積和成巖兩方面具體分析了優(yōu)質(zhì)儲(chǔ)層發(fā)育的主控因素。 孔雀河斜坡志留系土什布拉克組為一套發(fā)育于無障壁海岸沉積體系中的粗粒砂質(zhì)辮狀河三角洲沉積,主要發(fā)育有辮狀分流河道、辮狀砂壩、水下分流河道、河口壩、水下分流間灣等沉積微相。巖性以巖屑砂巖為主,成分成熟度中等-差,結(jié)構(gòu)成熟度中等-好。成巖作用類型主要為壓實(shí)作用、膠結(jié)作用、溶蝕作用和構(gòu)造碎裂作用,受構(gòu)造抬升剝蝕影響成巖演化程度不高,自侏羅紀(jì)至今一直處于中成巖階段A期。 土什布拉克組總體上符合中石化Ⅳ-Ⅴ類儲(chǔ)層標(biāo)準(zhǔn),屬于特低孔特低滲-特低孔超低滲型致密砂巖儲(chǔ)層,儲(chǔ)層類型主要為孔隙型、孔隙-裂縫型,孔隙度與滲透性具明顯的正相關(guān)關(guān)系,但相關(guān)性不好,受微裂縫影響較大,具有雙介質(zhì)特征�？紫额愋鸵匀芪g孔為主,其次為殘余原生粒間孔和微裂縫,孔隙總體上表現(xiàn)為細(xì)孔細(xì)喉-微孔微喉的結(jié)構(gòu)特征,孔喉連通性較差。根據(jù)沉積微相與物性和電性的對應(yīng)關(guān)系,可將土什布拉克組致密砂巖儲(chǔ)層劃分為三種類型。 母巖的性質(zhì)決定了土什布拉克組儲(chǔ)層低孔低滲的基本特點(diǎn),在此基礎(chǔ)上沉積分異作用對儲(chǔ)層進(jìn)行了最初的改造,并通過不同沉積微相類型所對應(yīng)的物性特征體現(xiàn)出來。沉積分異作用對后期的成巖改造也存在很大影響,原生物性相對較好的儲(chǔ)層受建設(shè)性成巖作用改造也更為強(qiáng)烈。總體上粒度較粗的巖相所對應(yīng)的沉積相帶整體儲(chǔ)集性能要好于細(xì)粒巖相所對應(yīng)的沉積相帶,沉積微相是最為主要的控制因素。目前限于地震資料的反射品質(zhì),難以對儲(chǔ)層進(jìn)行橫向上的預(yù)測,隨著三維地震的開展和地震分辨率的提高,結(jié)合地震資料對該地區(qū)砂體展布及儲(chǔ)層進(jìn)行精確預(yù)測將成為可能。
[Abstract]:The Kongqihe slope is located in the northeast of Tarim Basin. It is a transitional slope zone between the Kueruktag uplift and the Manchar depression, which is generally high in the north-east and low in the south and west. The Silurian Tushburak formation in the area is a set of tight sandstone reservoirs. Although it has good natural gas indication, the geological conditions are complex due to the influence of long-term tectonic evolution and multi-stage tectonic superposition. The whole reflection quality of Silurian seismic data is poor and exploration is difficult. Previous studies mainly focus on reservoir formation, but the research on reservoir is relatively weak. Based on the study of sedimentary facies, reservoir characteristics, diagenesis and diagenetic evolution sequence of the Silurian Tushburak formation on the Kongqihe slope of Tarim Basin, the tight sandstone reservoirs of the Tushburak formation are classified and evaluated. The main controlling factors for the development of high quality reservoirs are analyzed from both sedimentary and diagenetic aspects. The Silurian Tushbulak formation on the Kongqihe slope is a series of coarse-grained braided river delta deposits developed in barrier-free coastal sedimentary systems, which are mainly composed of braided distributary channels, braided sand dams, underwater distributary channels and estuarine dams. Underwater distributary bay and other sedimentary microfacies. Lithology is dominated by lithic sandstone with moderate-poor composition maturity and medium-good structural maturity. The diagenetic types are mainly compaction, cementation, dissolution and tectonic fragmentation. The evolution degree of diagenetic rocks affected by tectonic uplift and denudation is not high, and it has been in stage A of middle diagenesis since Jurassic. The Tushburak formation generally accords with the class 鈪，

本文編號(hào)：2435748