贝尔凹陷布达特群成岩作用

Diagenesis of Budate group in Beier depression

成岩作用是碎屑岩储层发育的重要控制因素之一.在对贝尔凹陷布达特群岩心观察、显微镜分析和地化指标测试的基础上,对其成岩作用特征进行深入研究.结果表明,布达特群成岩作用主要有压实作用、胶结作用、溶蚀作用等7种类型,布达特群大都处于中成岩阶段B亚期,部分为晚成岩阶段;溶蚀作用和破裂作用对改善储集性能起建设性作用,而压实、胶结、充填作用等起破坏性作用;溶蚀作用主要发生在不整合面附近,而破裂作用主要发生断裂带及其附近应力集中的区域.

Diagenesis is an important control factor in the development of clastic reservoir.Further study was done in diagenesis on the base of core observation,microscopic analysis and geochemical index test of Budate group in Beier depression.It indicates that the main kinds of diagenesis in Budate group are compaction,cementation,denudation and other four types;and the main diagenesis stage of Budate group is B subunit of diagenesis.Dissolution and cataclasis played a constructive role in improving the reservoir performance,while compaction,cementation,packing action and others played a destructive role.Dissolution occurred distinctively near the unconformity interface,and fractures most developed in fracture belt.