【摘要】：砂礫巖作為重要油氣儲層類型之一,以非均質(zhì)性顯著、易受成巖作用影響為特征,因而分析其成巖作用及對儲集性能的影響是儲層研究的關(guān)鍵。文章在準噶爾盆地西北緣瑪湖凹陷地區(qū),以最近勘探取得重大突破的西斜坡艾湖油田下三疊統(tǒng)百口泉組(T1b)緩坡扇三角洲砂礫巖儲層為例,研究了成巖作用類型及對儲集能力的影響。結(jié)果表明,研究區(qū)砂礫巖主要發(fā)育了四種成巖作用類型:壓實、交代(碎屑長石的鈉長石化和蒙皂石的伊利石化)、溶蝕(鉀長石和方解石等)和膠結(jié)(方解石、高嶺石和少量綠泥石)。它們對儲集性能的影響差異顯著。壓實作用顯著破壞了顆粒間的原生孔隙,降低了儲層物性;礦物交代總體對儲層物性影響有限;相比而言,在斷裂溝通含烴流體促進下,鉀長石等礦物的溶解在扇三角洲前緣的水下河道與顆粒流沉積等具有較好初始物性的砂礫巖,形成了次生孔隙發(fā)育帶,顯著改善了砂礫巖的儲集性能;膠結(jié)作用不利于砂礫巖成巖中晚期孔隙的保存,特別是高嶺石和方解石的局部富集導致了低滲透層的形成。據(jù)此,發(fā)現(xiàn)研究區(qū)不同段的儲層發(fā)育有明顯差異,由下至上百一段在油源斷裂附近發(fā)育優(yōu)質(zhì)儲層;百二段在油源斷裂的上傾位置發(fā)育優(yōu)質(zhì)-較好儲層;而百三段研究區(qū)儲層幾乎不發(fā)育。
[Abstract]:As one of the important oil and gas reservoir types, sandy gravel is characterized by remarkable heterogeneity and easy to be influenced by diagenesis. Therefore, the analysis of diagenesis and its influence on reservoir performance is the key to reservoir research. In the Mahu sag area of the northwestern margin of Junggar Basin, this paper takes the lower Triassic Baikouquan formation (T1b) mild-slope fan delta sandy gravel reservoir as an example, which has recently made a major breakthrough in exploration. The types of diagenesis and its influence on reservoir capacity are studied. The results show that there are four types of diagenesis: compaction, metasomatism (albite of clastic feldspar and Illite of montmorillonite), dissolution (potash feldspar, calcite, etc.) and cementation (calcite, etc.). Kaolinite and a small amount of chlorite There are significant differences in their effects on reservoir performance. Compaction significantly destroys primary pores between particles and reduces reservoir physical properties; mineral metasomatism as a whole has a limited effect on reservoir physical properties; comparatively speaking, when faults communicate with hydrocarbon bearing fluids, The dissolution of potassium feldspar and other minerals in the subaqueous channel and grain flow deposition in the front of the fan delta, which have better initial physical properties, formed the secondary pore development zone, and improved the reservoir performance of the sandy gravel. The cementation is not conducive to the preservation of pores in the late diagenetic period of sandy gravel, especially the local enrichment of kaolinite and calcite, which leads to the formation of low permeability layers. On this basis, it is found that there are obvious differences in the development of reservoirs in different sections of the study area, from the bottom to hundreds of segments developing high quality reservoirs near the oil-source faults, and the Baier member develops high-quality and better reservoirs at the upward dip of the oil-source faults. The reservoir in the study area of the third member is almost undeveloped.
【作者單位】： 中國石油新疆油田分公司實驗檢測研究院;南京大學地球科學與工程學院;
【基金】：國家科技重大專項(2016ZX05001-005)
【分類號】：P618.13

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