本文關(guān)鍵詞：靖邊潛臺(tái)西北側(cè)馬五段碳酸鹽巖古巖溶儲(chǔ)層的形成與天然氣成藏規(guī)律　出處：《西北大學(xué)》2016年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 靖邊氣田 沉積相 古地貌 碳酸鹽巖儲(chǔ)層 氣水分布 天然氣成藏

【摘要】：鄂爾多斯盆地下古生界奧陶系馬五段主要以碳酸鹽巖為主,以1989年在陜參1井馬五段獲得高產(chǎn)氣流為標(biāo)志,現(xiàn)已發(fā)現(xiàn)靖邊大型氣田。馬五段碳酸鹽巖儲(chǔ)層形成時(shí)代老,經(jīng)歷了多期復(fù)雜的成巖演化,儲(chǔ)層非均質(zhì)強(qiáng),氣、水分布規(guī)律復(fù)雜,成藏過(guò)程研究有待深化。已發(fā)現(xiàn)的靖邊氣田主要位于巖溶潛臺(tái),其西北側(cè)是目前增儲(chǔ)上產(chǎn)的重點(diǎn)地區(qū)。因此開(kāi)展該地區(qū)沉積相、古地貌古巖溶特征、儲(chǔ)層特征,結(jié)合氣、水分布規(guī)律及包裹體流體示蹤研究探討下古生界天然氣成藏過(guò)程,對(duì)馬五段碳酸鹽巖勘探、開(kāi)發(fā)具有重要的理論意義和應(yīng)用價(jià)值。利用測(cè)井、錄井、巖心觀察等基礎(chǔ)資料,結(jié)合鑄體薄片、掃描電鏡、陰極發(fā)光等分析手段,對(duì)研究區(qū)沉積相、古地貌和古巖溶特征進(jìn)行了研究;根據(jù)壓汞、氣水相滲、核磁共振、主微量元素、稀土元素、Sr和C/O同位素等實(shí)驗(yàn)數(shù)據(jù)綜合研究了儲(chǔ)層的特征,并對(duì)儲(chǔ)層進(jìn)行了綜合評(píng)價(jià)；基于試氣數(shù)據(jù)和地層水分析數(shù)據(jù),總結(jié)了氣、水分布的控制因素,以流體包裹體分析為基礎(chǔ),結(jié)合天然氣成藏條件分析,探討天然氣成藏規(guī)律。研究認(rèn)為,馬五段沉積環(huán)境為潮上帶-潮問(wèn)帶沉積,發(fā)育5種沉積微相,水體主要從北東東、南西及南東方向侵入。西北部為巖溶高地,局部發(fā)育殘丘及洼地,中東部為巖溶斜坡,發(fā)育緩丘、淺洼和近東西向展布的5條古溝槽。儲(chǔ)層經(jīng)歷了同生期巖溶、表生期巖溶和埋藏期巖溶,巖溶高地上的殘丘、巖溶斜坡中的緩丘及溝槽兩側(cè)部位為有利巖溶儲(chǔ)層發(fā)育地區(qū)。儲(chǔ)層巖石類(lèi)型以白云巖為主,含裂縫、孔洞的物性比基質(zhì)物性好,膠結(jié)充填作用,溶蝕作用對(duì)儲(chǔ)層物性改造較大。馬五1亞段中白云石+石英+高嶺石膠結(jié)-溶孔相、馬五2亞段中白云石+石英+方解石膠結(jié)-溶孔相以及馬五4’亞段中白云石+石英+高嶺石膠結(jié)-溶孔相的物性最好。發(fā)育溶孔-晶間(溶)孔復(fù)合型(Ⅰ類(lèi))、晶間(溶)孔-裂縫型(Ⅱ類(lèi))、裂縫-微孔隙型(Ⅲ類(lèi))和微孔隙型(Ⅳ類(lèi))等四類(lèi)孔隙結(jié)構(gòu)。白云石化作用主要發(fā)生在油氣生成前的淺-中等埋藏期,其次為發(fā)生在準(zhǔn)同生期和生物化學(xué)生氣階段,脈體狀方解石主要形成于烴源巖排烴之后的中-深埋藏階段。氣、水分布宏觀受控于古巖溶地貌與成巖作用背景,微觀上受控于儲(chǔ)層的物性、孔隙連通性。晚侏羅世早期,發(fā)生第1期油氣充注,形成小范圍氣藏；早白堊世晚期發(fā)生第1Ⅱ期油氣運(yùn)移和成藏,此后氣藏經(jīng)調(diào)整后在殘丘、緩丘及溝槽兩側(cè)高部位聚集,形成了現(xiàn)今的氣藏形態(tài)。
[Abstract]:The lower Paleozoic Ordovician Ma-Wu formation in Ordos Basin is dominated by carbonate rocks, marked by the high gas flow obtained in Shaanshen No. 1 formation in 1989. It has been found that the carbonate rock reservoir of the fifth member of the formation age of Jingbian gas field, experienced multiple periods of complex diagenetic evolution, the reservoir heterogeneity, gas and water distribution is complex. The discovered Jingbian gas field is mainly located in the karst submersible platform, and the northwest side of the gas field is the key area where the reservoir is increased. Therefore, the sedimentary facies, paleogeomorphology and palaeokarst characteristics and reservoir characteristics are developed in this area. The study of gas and water distribution law and fluid tracer of inclusions is of great theoretical significance and application value for exploration and development of carbonate rocks in the Lower Paleozoic. The characteristics of sedimentary facies, paleogeomorphology and paleokarst in the study area were studied by means of core observation and other basic data, combined with casting thin slice, scanning electron microscope and cathodoluminescence. According to the experimental data of mercury injection, gas-water permeation, nuclear magnetic resonance, main trace elements, rare earth elements such as Sr and C / O isotopes, the reservoir characteristics are comprehensively studied, and the reservoir is evaluated synthetically. Based on gas test data and formation water analysis data, the controlling factors of gas and water distribution are summarized. Based on fluid inclusion analysis and natural gas accumulation condition analysis, the law of natural gas accumulation is discussed. There are five sedimentary microfacies developed in the sedimentary environment of the fifth member, namely, the upper tidal belt and the tidal zone. The water body mainly invades from the north, west, south and east. The northwest is the karst highland, and the residual hills and depressions are locally developed. The middle and eastern part is a karst slope, with a gentle hill, shallow depression and 5 paleo-trenches distributed near east-west. The reservoir experienced syngenic karst, supergene karst and burial karst, and the residual hills in karst highlands. The areas on both sides of the gentle hills and grooves in karst slopes are favorable for the development of karst reservoirs. The main rock types of the reservoirs are dolomite, the physical properties of fractures and cavities are better than those of matrix, and the cementation filling process. Dissolution has great influence on the reservoir physical properties. The dolomite quartz kaolinite cementation and dissolved pore facies in the Ma 51 submember. The physical properties of dolomite quartz calcite cementation phase and dolomite quartz kaolinite kaolinite cementation phase are the best in the Ma Wu 2 submember. Class 鈪，

本文編號(hào)：1408630