和田河气田石炭系沉积相特征与演化

和田河气田石炭系主要发育混合台地、碎屑滨岸和浅海（陆棚）沉积相，混合台地是区内主要沉积相，可划分出4种亚相，当台内有水下隆起时，由岸向海4种亚相发育齐全，反之，则缺失局限台地和台内滩亚相，混合台地相具有物源近、水体浅、能量较弱的特点，总体上为细粒为主的碎屑岩和炭酸盐互层沉积，当气候干燥炎热或水体受到局限时，还可形成大量石膏沉积，碎屑滨岸相分布在石炭系砂砾岩段，划分为后滨、前滨及临滨亚相，以细粒碎屑岩为主，浅海陆棚相分布在石炭系下泥岩段，主要为泥岩夹砂岩，在中、晚海西运动影响下，石炭系从巴楚期、卡拉沙依期到小海子期整体表现为一次大的海侵－海退旋回，沉积环境也表现为由碎屑滨海向混合浅水台地的演化。

CHARACTERISTICS AND EVOLUTION OF CARBONIFEROUS SEDIMENTARY FACIES IN HETIAN RIVER GASFIELD

The Carboniferous System in Hetian River Gasfield was mainly formed of a set of interbedded clastic rocks,carbonate rocks as well as interbedded gypsum,mixed plateform shore clastic and shelf facies.The mixed plateform could be divided into tidal,limited plateform,beach,open plateform subfiacies.When the beach existed,all the subfacies would occur from the shore to sea direction;in reverse,the limited plateform and intraplateform subfacies would absent.But in early Carboniferous,it was formed by clastic shore shelf deposits.Carboniferous System in the area underwent the evolution of shore shelf to mixed plateform resulted from the middle late Hercynian tectonic movement,showing a large scale of ingression regression cycle from Bachu,Karashayi stages to Xiaohaizi stage in the Carboniferous Period.