准噶尔盆地石炭系烃源岩分布及地球化学特征

通过对准东和腹部97口钻井的统计分析,从石炭系烃源岩分布、有机质类型、丰度及热演化程度等方面对烃源岩进行了综合评价,研究了石炭系的生烃能力。石炭系烃源岩在准东和腹部地区分布广泛,以凝灰岩和沉凝灰岩为主。下石炭统烃源岩主要分布在滴水泉及五彩湾地区,为还原环境下腐泥—腐殖型好烃源岩,上石炭统主要分布在准东大井、帐北地区及石西、夏盐和五彩湾地区,为弱还原—还原环境下的成熟腐泥—腐殖型较好烃源岩。近几年,陆续发现了石炭系自生自储的油气,石炭系的勘探前景良好。

Distribution of Carboniferous Hydrocarbon Source Rock in Junggar Basin and Geochemical Characteristics

The paper makes statistical analysis of 97 wells drilled in the eastern part and hinterland of Junggar Basin and integrated assessment on hydrocarbon source rock in terms of Carboniferous hydrocarbon source rock distribution, organic matter type, abundance and thermal evolution degree. The paper makes study of Carboniferous hydrocarbon generation capacity. Carboniferous source rock is extensively distributed in the eastern part and hinterland of Junggar Basin, mainly tuff and sedimentary tuff. Lower Carboniferous hydrocarbon source rock is distributed mainly in the Dishuiquan and Wucaiwan area. It is promising source rock of sapropelic-humic type under the reduction environment. Upper Carboniferous source rock is distributed mainly in the regions of Dajing, Zhangbei Shixi, Xiayean and Wucaiwan in the eastern part of the basin. It is the relatively desirable source rock of the mature sapropelic-humic type under the weak reduction to reduction environment. The Carboniferous self-sourcing and self-stored oil and gas is also found in the recent years, indicating a promising prospect for exploration of Carboniferous.