吐哈盆地台北凹陷煤成烃特征及形成

本文从油气基本性质、类型、成熟度、油气源分析以及煤，岩生烃、排烃机理等方面，以详尽的资料论证了目前在台北凹陷（不包括胜金口油田）所发现的油气是煤成烃，并得出如下结论：①该区的原油具有陆相原油的典型特征，从物性和成因上可以分为三类；②该区的煤成气以甲烷碳同位素偏轻、重烃气体碳同位素偏重为特征；③该区的原油和天然气成熟度低，来源于中、下侏罗统煤系源岩（主要是煤）；④该区能形成工业性煤成油气流与该区煤岩富氢组分含量高并具早期生、排烃等特点，以及良好的生储盖条件有关。

CHARACTERISTICS AND FORMATION OF COALGENERATED HYDROCARBONS IN TAIBEI DEPRESSION, TURPAN-HAMI BASIN

This paper presents detailed studies of the gross properties, types and maturity of oil and gas, the oil-source correlation, and the mechanism of generation and expulsion of coal-generated hydrocarbons. It is demonstrated that the oil and gas in the Taibei depression (excluding the Shenjingkou oilfield) is coal-generated hydrocarbons. The oil there possesses the typical characteristics of terrestrial oil, and can be subdivided into three groups based on its origin and physical property. The gases are characterized by rich light carbon isotope in methane and rich heavy carbon isotope in heavy hydrocarbons (C_2,-C_4). All the oil and gases in the Taibei depression are unanimously of low maturity, and originated from the coal measures (mainly from coal) of the middle and lower Jurassic strata. The coal in the TurpanHami basin contains rich hydrogen-rich macerals with characteristics of early hydrocarbon generation and expulsion. The Jurassic strata in the Taibei depression is a favorable source reservoir-seal unit, which is basic for the formation of commercial coal-generated oil and gas reservoirs.