塔里木盆地柯克亚凝析气田异常高压成因分析

摘要

异常地层压力既是油气运聚的重要动力来源，又是控制油气分布的重要因素。塔里木盆地柯克亚凝析气田新近系西河甫组西八段至古近系卡拉塔尔组油气藏表现出异常高压特征，超高的异常压力为该带油气勘探造成很大制约。从柯克亚凝析气田异常压力特征着手，对异常高压成因进行研究，认为源岩成烃及欠压实作用不是造成该地区超压的主要原因。该地区的超压主要是由侧向构造挤压、构造形变和推覆体加载等构造因素综合作用形成。其中，构造挤压是最主要因素。%Abnormal pressure is not only the major dynamic source of hydrocarbon migration and accumulation, but al-so the important factors for controlling the hydrocarbon distribution.Kekeya condensate gas field,from whose Xi-8 mem-ber of the Neogene Xihefu Formation to the Paleogene Kalatar Formation appears abnormal high pressure. Ultra high ab-normal pressure plays an important role in controlling the oil & gas exploration in this zone. Detailed study on the gene-sis of abnormal pressure has been conducted based on its characteristics. Comprehensive analysis show that:hydrocarbon generation of source rocks and the under-compaction are not the main causes of the overpressure in the region.The over-pressure in this area is mainly formed by combination factors of lateral tectonic compression and structure deformation, loading nappe,of which tectonic compression is the principal factor.