CAJ | 학술논문

运用铸体薄片鉴定、扫描电镜、X-衍射等测试方法，系统研究了鄂尔多斯盆地高桥地区二叠系盒8段储集砂岩的成岩作用类型及其对储层的控制作用。研究区致密砂岩储层沉积后经历了复杂的成岩作用，压实作用导致原生粒间孔大量丧失，胶结作用在降低原生粒间孔的同时增加了骨架颗粒的强度，有利于残余原生粒间孔的保存，交代作用表现为高岭石交代长石以及铁方解石交代石英碎屑，溶蚀作用使砂岩中不稳定的碎屑颗粒及胶结物溶解，改善砂岩储层的储集性，破裂作用形成微裂缝。通过对不同成岩作用在储集砂岩的孔隙生成和损失方面的定量评价研究后认为，压实作用使孔隙度减小最多，达22.40％～33.17％，平均降低27.166％；其次为胶结作用和交代作用，使孔隙度损失5.5％～17％，平均损失为10.01％；而溶蚀作用使孔隙度增加6.86％～8.41％，平均增加8.586％。正是上述多种成岩作用改造的最终造成了研究区致密砂岩储层的孔隙特征。
운용주체박편감정、소묘전경、X-연사등측시방법，계통연구료악이다사분지고교지구이첩계합8단저집사암적성암작용류형급기대저층적공제작용。연구구치밀사암저층침적후경력료복잡적성암작용，압실작용도치원생립간공대량상실，효결작용재강저원생립간공적동시증가료골가과립적강도，유리우잔여원생립간공적보존，교대작용표현위고령석교대장석이급철방해석교대석영쇄설，용식작용사사암중불은정적쇄설과립급효결물용해，개선사암저층적저집성，파렬작용형성미렬봉。통과대불동성암작용재저집사암적공극생성화손실방면적정량평개연구후인위，압실작용사공극도감소최다，체22.40％～33.17％，평균강저27.166％；기차위효결작용화교대작용，사공극도손실5.5％～17％，평균손실위10.01％；이용식작용사공극도증가6.86％～8.41％，평균증가8.586％。정시상술다충성암작용개조적최종조성료연구구치밀사암저층적공극특정。
Based on the thin section examination ,SEM,X-ray diffraction ,this paper studied the diagenetic types and their control on reservoirs in the 8th Member of Xiashihezi Formation (He8)tight sandstone in Gaoqiao region .The He8 reservoir has experienced complex diagenesis after deposition .Compaction resulted in the loss of primary intergranular pores .And ce-mentation reduces the primary intergranular pores while increasing the strength of the skeleton particles ,which is conducive to the preservation of residual primary intergranular pore .Replacement in the study area features in feldspar replacing kao-linite and iron calcite replacing quartzes debris .Dissolution improves the reservoir physical properties by dissolving the un -stable detrital grains and cements .Fracturing causes the formation of micro-fractures .Quantitative evaluation of the increase and decrease of the porosity caused by different diagenesis reveals that compaction is the most significant in porosity reduc -tion,being about 22.40%-33.17%,with an average of 27.166%,followed by cementation and replacement ,bing about 5.5%-17%,with an average of 10.01%.In contrast ,dissolution increases porosity about 6.86%-8.41%,with an ave-rage of 8.586%.The porosity of the tight sandstone is the final result of the different diagenesis .