【摘要】：鄂爾多斯盆地臨興地區(qū)具有巨大的天然氣勘探開發(fā)潛力,是我國重要的致密砂巖氣接替區(qū),但其致密砂巖儲層物性較差,儲層致密化成因復(fù)雜,制約了該區(qū)致密砂巖氣的產(chǎn)業(yè)化發(fā)展。根據(jù)X射線衍射、掃描電鏡、陰極發(fā)光、鑄體薄片、流體包裹體及分析化驗等資料,對研究區(qū)山西組致密砂巖儲層特征及成因進(jìn)行了系統(tǒng)研究。結(jié)果表明:該區(qū)砂巖儲層巖性主要為巖屑砂巖和次巖屑砂巖,儲集空間以剩余原生粒間孔和次生溶蝕孔為主;砂巖儲層物性較差,平均孔隙度為5.9%,平均滲透率為0.073 m D,排驅(qū)壓力和飽和度中值壓力均較高,孔喉半徑小且分選性較差,孔隙結(jié)構(gòu)參數(shù)總體較差。對致密砂巖儲層成巖序列的劃分表明,該區(qū)砂巖儲層具有4個世代的黏土充填,多期次的黏土充填使儲層逐漸致密化�？紫抖妊莼糠治霰砻�,該區(qū)儲層質(zhì)量主要受壓實作用和膠結(jié)作用的影響,早成巖階段壓實作用造成17.1%的孔隙度損失,中成巖階段壓實作用和膠結(jié)作用造成22.9%的孔隙度損失,其中,膠結(jié)作用中的黏土礦物大量充填孔隙并堵塞喉道,不僅導(dǎo)致原生粒間孔隙變成了微小的晶間孔隙,而且使孔隙表面變得粗糙,迂回度增加,導(dǎo)致儲層孔隙度和滲透率大大降低。
[Abstract]:Linxing area of Ordos Basin has great potential for natural gas exploration and development. It is an important tight sandstone gas replacement area in China, but its physical properties of tight sandstone reservoir is poor, and the formation of tight sandstone reservoir is complex. The industrial development of tight sandstone gas in this area is restricted. Based on the data of X-ray diffraction, scanning electron microscope, cathodoluminescence, thin sheet casting, fluid inclusion and analytical analysis, the characteristics and genesis of tight sandstone reservoir of Shanxi formation in the study area were systematically studied. The results show that the lithology of sandstone reservoir in this area is mainly lithic sandstone and secondary lithic sandstone, and the remaining primary intergranular pore and secondary dissolution pore are the main reservoir space. The sandstone reservoir has poor physical properties, average porosity of 5.9%, average permeability of 0.073 m D, high displacement pressure and saturation median pressure, small pore throat radius and poor sorting, and poor pore structure parameters. The diagenetic sequence of tight sandstone reservoir shows that the sandstone reservoir in this area has four generations of clay filling, and the multi-stage clay filling gradually densifies the reservoir. The quantitative analysis of porosity evolution shows that the reservoir quality in this area is mainly affected by compaction and cementation, and the porosity loss of 17.1% is caused by compaction during early diagenesis. Compaction and cementation in the middle diagenesis stage caused 22. 9% porosity loss. Among them, the clay minerals in the cementation process filled the pores and blocked the throat, which not only caused the primary intergranular pores to become tiny intergranular pores, Moreover, the pore surface becomes rough and the roundness increases, which results in the decrease of reservoir porosity and permeability.
【作者單位】： 中國地質(zhì)大學(xué)(北京)海相儲層演化與油氣富集機(jī)理教育部重點實驗室;中國地質(zhì)大學(xué)(北京)頁巖氣勘查與評價國土資源部重點實驗室;中石化勘探分公司;中聯(lián)煤層氣有限責(zé)任公司;
【基金】：國家科技重大專項“大型油氣田及煤層氣開發(fā)”子課題“鄂爾多斯盆地石炭—二疊系煤層氣勘探開發(fā)示范工程”(編號:2011ZX05062-001)
【分類號】：P618.13

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