哈萨克斯坦HK-2井中石炭统沉积环境分析

HK-2井位于哈萨克斯坦西部阿特劳州阿特劳市西北约320 km处。该井钻遇的中石炭统岩石类型包括白云岩、石灰岩、硅岩、砂岩和黏土岩，但以硅岩和黏土岩为主，而且成分混杂，交互频繁，富含有机质和深水相的浮游、游泳类微体生物化石。根据岩石中硅质放射虫化石含量高，硅质海绵骨针个体保存完整，有机质含量高，颜色暗，组分细小，泥质、硅质成分为主及生物组合单一等特征，认为该地区中石炭统为深水沉积环境。目前正在勘探的HK-2井所在的乌拉尔区块也已发现深水类型油气藏存在的苗头，建议对该地区深水相油气藏进行调研，同时对该区块和相邻区块能够获得的地震剖面进行追踪分析研究。

Sedimentary environment analysis of the Middle Carboniferous of Well HK-2 in Kazakhstan

Well HK-2 is located 320 km northwest of Atelao City of Atelao State， western Kazakhstan. Rock types of the Middle Carboniferous in Well HK-2 include dolostone， limestone， siliceous rocks， sandstone and claystone. Siliceous rocks and claystone are the dominant types with mixed components， frequent interclayering， abundant organic materials and floating and swimming microbials of deep water facies. The Middle Carboniferous in this area was identified as deposits of a deep water environment， according to the high content of siliceous radiolarian fossils in the rocks， the complete preservation of siliceous sponge spicules， combined with high content of organic materials， dark color， fine grained components， muddy and siliceous components as the dominant ones， and single bioassemblages. It is still unclear whether deep water hydrocarbon accumulations exist in the Wulaer block where Well HK-2 is located. The authors propose that further studies should be carried out on deep water hydrocarbon accumulations. At the same time seismic profiles in this block and the adjacent blocks should be analyzed.