伊朗KASHAN区块库姆组碳酸盐岩层序地层特征

Car-bonate sequence stratigraphic characteristics in Qom formation of KASHAN Block in Iran

伊朗KASHAN区块是中国石化海外油气勘探市场的一部分。作为主要勘探目的层的渐新一中新统中下部库姆组在该区沉积了数千米厚的海相碳酸盐岩系,发育8种沉积相11种亚相。从层序地层学的角度分析认为:库姆组为一个完整的沉积旋回,属于二级层序;在此基础上,将其划分为两个三级层序。文章结合海平面变化对沉积环境的影响,分析了有利的生、储、盖组合,指出了该区良好的油气开发远景。

KASHAN Block in Iran is one of the abroad oil-gas exploration task of SINOPEC.By way of a main explo-ration target stratum,Qom formation that lies at the mid -lower part of Oligocene to Miocene deposited several thousand meters of marine carbonates,with 8 sedimen-tary facies and 11 subfacies.From the standpoint of se-quence stratigraphy,it is considered that Qom formation is a whole sedimentary cycle,being second-order se-quence;on the base of this,it is divided into 2 third-order sequences.In this paper,combined the influence of the change of sea level on sedimentary environment, favorable source-reservoir-caprock assemblage was analyzed,good petroleum development prospect in this area was indicated.