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通过深入研究柴达木盆地台深1井新近系碎屑岩的孔隙结构及其微观电镜观察、压汞分析表明:柴达木盆地台深1井新近系碎屑岩主要为长石岩屑砂岩和岩屑砂岩类,填隙物质量分数中等-高;储集空间主要为溶蚀粒间孔隙、溶蚀粒内孔隙及少量的晶间微孔和铸模孔.喉道类型有片状及弯片状喉道、孔隙缩小型喉道.储层的孔隙结构主要受到沉积环境和成岩作用的影响.狮子沟组碎屑岩物性属于中-高孔、低-中渗;上油砂山组碎屑岩属于低-特低孔、特低渗.狮子沟组泥质粉砂岩、粉砂岩、细砂岩可以成为相对较好的油气储层,埋藏较深(3150~4290.9m),具有碎屑岩,属于特低孔-特低渗储集层特征.在早-晚成岩作用阶段有机质的热成熟作用形成大量的有机酸,对碎屑岩孔隙度和连通性有明显的建设性,是油气储集的有利场所,可作为重点的油气勘探对象.
Through in-depth study on the pore structure of the Neogene clastic rocks in the Taishen-1 well of the Qaidam Basin and its microscopic electron microscopic observation, the mercury intrusion analysis shows that the Neogene clastic rocks in the Taishen-1 well in the Qaidam Basin are mainly feldspar lithic sandstone And lithic sandstone, the interstitial mass fraction is medium-high, and the main reservoir space is dissolved intergranular pores, dissolved intragranular pores and a few intergranular micro-pores and mold holes.The types of throat are lamellar and curved Throat and pore shrinkage throat.The pore structure of the reservoir is mainly affected by sedimentary environment and diagenesis.The clastic rocks in the Shizigou Formation belong to medium-high porosity and low-permeability; the clastic rocks in the Upper Yanshan Formation belong to Low-ultra-low porosity and extra-low permeability. The Zhizigou muddy siltstone, siltstone and fine sandstone can be relatively good reservoirs of oil and gas, with deeper burial (3150 ~ 4290.9m), clastic rocks, Low porosity and low permeability reservoirs.Heat maturation of organic matter during the early-late diagenesis stage formed a large amount of organic acids, which was obviously constructive to the porosity and connectivity of clastic rocks and was favorable for hydrocarbon accumulation Place, can be used as the focus of oil and gas exploration.