库车油气系统烃类的流体相态特征研究

A RESEARCH ON PHASE CHARACTERISTICS OF THE HYDROCARBONS IN KUCHE PETROLEUM SYSTEM

库车油气系统已经发现了 2 2个油气藏 ,其相态类型的多样性的特点十分鲜明 ,据这些油气藏的 43层PVT实验数据和相图 ,可以把库车油气系统的烃类分为四类 7种。探明的油气储量和油气资源预测结果表明该系统“整体富气” ,黑油、挥发油处于从属地位 ,而且多为分异作用形成的伴生型和残余型的轻质油。综合分析油、气的物理性质、相态参数和系统的油气资源等地质条件 ,可明显地看出天然气的干湿程度及凝析油含量的高低主要受烃源岩成熟度控制 ;系统的成藏条件和勘探成果 (特别是克拉 2大气田的发现 )都说明高温裂解气潜力很大 ,其主要分布在北带中段高—过成熟区 。

22 oil and gas reservoirs have been found in Kuche petroleum system, being of various phase state types. According to the PVT experimental data and phase diagrams of 43 layers in these reservoirs, the hydrocarbons in Kuche petroleum system may be divided into 4 types and 7 subtypes. The results of studying the proved oil and gas reserves and predicted oil and gas resources indicate that the petroleum system is mainly rich in natural gas and the black oil and volatile oil sit in subordinate status, being mostly the associated and residual volatile oil formed by differentiation. Through comprehensively analyzing the physical properties and phase parameters of the oil and gas and the oil and gas resources in the system, it is dearly shown that the heavy hydrocarbon content and condensate content in natural gas are mainly controlled by the maturities of hydrocarbon source rocks; the reservoir formation conditions and exploration results (especially the discovery of giant Kela-2 gas field) indicate that the high-temperature cracking gas is of a good potential in the system, mainly distributing in the high- and post-maturity areas in the middle section of northern zone; and a wide region is occupied mainly by condensate gas and associated liquid hydrocarbon in the system.