【摘要】：延長東區(qū)上古生界山西組分布范圍廣,儲層發(fā)育,試氣試采結(jié)果顯示較高的產(chǎn)氣量,為上古生界主力產(chǎn)氣層段。為了對山西組天然氣資源量進(jìn)行準(zhǔn)確評估,必須清楚認(rèn)知氣層。本文密切結(jié)合氣田勘探開發(fā)實踐,以錄井、測井、實驗分析及試氣試采等成果為依據(jù),以山西組氣層為對象,以“四性關(guān)系”研究為關(guān)鍵,在綜合地質(zhì)研究基礎(chǔ)上,對氣層成因機(jī)理進(jìn)行深入研究,并探討了氣層識別評價的方法和標(biāo)準(zhǔn)。研究結(jié)果表明,山西組為三角洲前緣亞相沉積,氣層主要發(fā)育在水下分流河道與河口壩砂體中。因成巖作用強(qiáng)烈多期,致使氣層表現(xiàn)形式多樣,形成機(jī)理復(fù)雜,既有常規(guī)高阻氣層,又有“低阻”氣,確定區(qū)內(nèi)“低阻”上限為40?·m。常規(guī)高阻氣層主要受生、儲、蓋組合的控制,而巖性細(xì)粒、孔隙結(jié)構(gòu)復(fù)雜、高礦化度水及高束縛水含量造就了“低阻”氣層的形成。采用測井曲線重疊法、交會圖法及陣列感應(yīng)測井對氣層進(jìn)行定性識別,建立測井解釋模型進(jìn)行定量識別,并建立綜合識別評價氣層的一套標(biāo)準(zhǔn),結(jié)合試氣試采結(jié)果進(jìn)行驗證,從而提高了氣層識別的準(zhǔn)確度。
[Abstract]:The Shanxi formation of Upper Paleozoic in Yanchang District has a wide distribution range and developed reservoir. The result of gas test and production test shows that the gas production rate is higher, which is the main gas producing zone of Upper Paleozoic. In order to accurately evaluate the natural gas resources of Shanxi formation, it is necessary to recognize the gas formation clearly. In this paper, based on the results of logging, experimental analysis and gas test and production, taking the gas formation of Shanxi formation as the object and taking the study of "four-sex relationship" as the key point, and on the basis of comprehensive geological research, this paper closely combines the exploration and development practice of gas fields. The formation mechanism of gas reservoir is deeply studied, and the methods and standards of gas reservoir identification and evaluation are discussed. The results show that Shanxi formation is delta front subfacies and gas layer is mainly developed in underwater distributary channel and estuarine bar sand body. As a result of strong diagenesis for many periods, the gas layer is characterized by various forms and complex formation mechanism. The upper limit of "low resistivity" in this area is determined to be 40? mm, which includes both conventional high resistivity gas formation and "low resistivity" gas. Conventional high resistivity gas reservoirs are mainly controlled by assemblages of generation, reservoir and cap, while the formation of "low resistivity" gas reservoirs is caused by the lithologic fine grains, complex pore structure, high salinity water and high bound water content. The method of log curve overlap, cross plot and array induction logging are used to identify gas reservoir qualitatively, and a logging interpretation model is established for quantitative identification, and a set of criteria for comprehensive identification and evaluation of gas reservoir are established, which are verified by test gas production test results. Thus, the accuracy of gas reservoir identification is improved.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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