中国主要克拉通盆地深层白云岩优质储层发育主控因素及分布

发布时间：2018-05-12 19:47

本文选题：克拉通盆地 + 深层　；参考：《天然气地球科学》2017年08期

【摘要】：克拉通盆地深层白云岩是中国陆上未来天然气勘探的重要领域。通过统计分析四川、塔里木、鄂尔多斯等中国主要克拉通盆地,明确深层白云岩主要类型为颗粒白云岩、微生物白云岩及结晶白云岩,孔隙类型以裂缝—孔洞型和裂缝—孔隙型为主。指出有利沉积微相是孔隙形成的物质基础,早期溶蚀作用是孔隙形成的必要条件,准同生—浅埋藏期等早期白云石化作用有利于准同生期形成的孔隙保存,表生岩溶及构造破裂作用起到改善储层物性的作用。明确了深层优质白云岩储层仍具有相控性,深层白云岩储层继承性大于改造性,其纵向分布不是受深度控制而是受早期沉积旋回控制,横向分布不是受岩溶作用控制而是受高能沉积相带控制。认为未来深层优质白云岩储层的勘探主要为"台内裂陷两侧"及碳酸盐岩缓坡之内缓坡—中缓坡。
[Abstract]:The deep dolomite in the craton basin is an important field of onshore natural gas exploration in China. Based on the statistical analysis of the major cratonic basins in Sichuan, Tarim and Ordos, it is clear that the main types of dolomite in the deep layer are granular dolomite, microbial dolomite and crystalline dolomite. The main types of pores are fracture-pore type and fracture-pore type. It is pointed out that the favorable sedimentary microfacies are the material basis of pore formation, the early dissolution is the necessary condition for pore formation, and the early dolomitization, such as quasi-syntectic and shallow burial period, is conducive to the preservation of the pores formed in the quasi-syntectic period. Supergene karstification and structural fracture play an important role in improving reservoir physical properties. It is clear that deep and high quality dolomite reservoir is still facies controlled, the inheritance of deep dolomite reservoir is greater than that of reformation, and its longitudinal distribution is controlled not by depth but by early sedimentary cycles. The transverse distribution is not controlled by karstification but by high energy sedimentary facies. It is considered that the exploration of the deep and high quality dolomite reservoir in the future is mainly "both sides of the platform rifting" and the mild-moderate slope within the carbonate gentle slope.
【作者单位】：中国石油杭州地质研究院;中国石油天然气集团公司碳酸盐岩储层重点实验室;
【基金】：中国石油天然气股份公司重大科技专项(编号:2014E-32) 国家科技重大专项(编号:2017ZX05008-005)联合资助
【分类号】：P618.13

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