【摘要】：成巖礦物的轉化是致密砂巖儲層物性變化的主要因素之一。為了探索二者之間的關系以及儲層致密化成因,采用薄片觀測、掃描電鏡分析、陰極發(fā)光分析等手段,結合成巖演化過程中的礦物熱力學特征和體積變化,探討了蘇里格氣田西南部山1段、盒8段砂巖的礦物組成、孔隙特征、礦物轉化機制及其對儲層孔隙的影響。結果表明:1膠結物以黏土礦物、方解石為主,硅質(zhì)少量;2綠泥石薄膜可包裹高嶺石和石英加大邊,偶見放射狀綠泥石且孔隙較好;3黏土礦物晶間孔占孔隙比重較高,高嶺石伊利石化后的晶間孔隙較發(fā)育,其次為溶蝕孔隙;4嵌晶狀方解石充填剩余粒間孔隙,并交代石英加大邊和伊利石,破壞儲層物性。認為中成巖A期的鉀長石溶蝕、蒙脫石伊利石化、高嶺石伊利石化、黑云母水化都會使得礦物體積變小,屬于增孔反應,在一定程度上改善儲層孔隙;且膠結作用增加儲層的抗壓實能力,在一定程度上保護了原生孔隙;故在分析膠結作用對物性的影響時,不能簡單地歸結為破壞性成巖作用。
[Abstract]:The transformation of diagenetic minerals is one of the main factors to change the physical properties of tight sandstone reservoirs. In order to explore the relationship between them and the formation of reservoir densification, thin slice observation, scanning electron microscope analysis and catholuminescence analysis were used to combine the thermodynamic characteristics and volume changes of minerals during diagenetic evolution. In this paper, the mineral composition, pore characteristics, mineral transformation mechanism and its effect on reservoir porosity of sandstones in the first and eighth member of Shan formation in southwestern Sulige gas field are discussed. The results show that the clay mineral and calcite are the main cementing materials, and a small amount of siliceous chlorite film can wrap the edge of kaolinite and quartz, and occasionally see radioactive chlorite and the pore size is better and the intergranular pore proportion of clay mineral is higher. The intergranular pores after kaolinite Illite are relatively developed, and the next is the dissolution pore, the intergranular calcite, filling the remaining intergranular pores, and replacing the quartz to enlarge the edge and the Illite, thus destroying the reservoir physical properties. It is considered that the dissolution of potassium feldspar, montmorillonite Illite, kaolinite Illite and biotite hydration in the A stage of the middle diagenetic rocks can make the mineral volume smaller, which is an increasing pore reaction and improves the reservoir porosity to a certain extent. The cementation increases the compaction resistance of the reservoir and protects the primary pores to a certain extent, so the analysis of the effect of cementation on physical properties cannot simply be attributed to destructive diagenesis.
【作者單位】： 山東科技大學地球科學與工程學院;海洋國家實驗室海洋礦產(chǎn)資源評價與探測技術功能實驗室;中國石油長慶油田蘇里格氣田研究中心;中國石油集團測井有限公司長慶事業(yè)部;
【基金】：國家自然科學基金(編號:41402120) 山東科技大學科研創(chuàng)新團隊計劃(編號:2010KYTD103)聯(lián)合資助
【分類號】：P618.13

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