阿姆河右岸地区侏罗系海相烃源岩生烃潜力  

Hydrocarbon Generation Potential of Jurassic Source Rocks in Right Bank of Amu Darya

作　　者：方杰[1] 徐树宝 吴蕾 欧阳华 聂明龙[1] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油阿姆河天然气勘探开发有限公司

出　　处：《海相油气地质》2014年第1期8-18,共11页Marine Origin Petroleum Geology

基　　金：中国石油天然气集团公司"阿姆河右岸中区天然气开发示范工程"资助项目(编号:2011ZX05059)部分研究成果

摘　　要：阿姆河右岸地区侏罗系发育三种类型的烃源岩,其有机质丰度均不相同,上侏罗统海相高伽马值泥岩的最高,其次为海相泥灰岩,中下侏罗统海陆过渡相煤系泥岩相对偏低,烃源岩的等级分别属于好烃源岩、中等烃源岩和中-差烃源岩.对比表明,这三种烃源岩的有机质丰度高于中国含油气盆地的同类型烃源岩,说明盆地具有油气生成的较好物质基础.本区海相烃源岩干酪根微组分中腐泥组含量高,但干酪根中氢原子含量低,有机质主要来源于藻类等低等生物.根据干酪根H/C 原子比、氢指数IH和碳同位素啄13C三项指标判断,上侏罗统海相烃源岩属于域-芋型母质.上侏罗统高伽马值泥岩和泥灰岩已达生烃高峰阶段（Ro大多在0.8%耀1.3%）,有利于常规油、凝析油和湿气的生成,总烃/有机碳已达到15.88%18.4%,接近域型烃源岩液态烃的产烃率,说明侏罗系海相烃源岩具有较高的生烃能力.Jurassic source rocks develops in Right Bank of Amu Darya in Amu-Darya Basin（Turkmenistan） and owing todifferent content of TOC, they can be divided into the good source rock（the Upper Jurassic marine higher-gamma mudstone）, themedium one （Upper Jurassic marine marlite） and the mid-poor one（Middle and Lower Jurassic coal-bearing mudstone） basedon the evaluation standard of organic matter abundance rank of China. According to the source-rock correlation, the organicabundance in these source rocks from Right Bank is higher than that in the similar source rocks from different petroliferous basinsin China （Tarim, Tuha, Sichuan and Bohaiwan basins）, which implies good hydrocarbon-generating materials in the basin. Thekerogen within the Jurassic marine source rock consists of high content of sapropel but possesses a low amount of hydrogen atomin it and so organic matter commonly comes from lower living beings such as algae. According to three indicators, i.e, kerogenH/C ratio, HI and 啄13C, it is judged that the organic precursor of the Upper Jurassic marine source rock belongs to Type ⅡtoType Ⅲof kerogen. The Upper Jurassic higher-gamma mudstone and marlite have entered into the peak stage of hydrocarbongeneration（0.8%-1.3% Ro for 80% of samples）, which is in favor of generating general oil, gas condensate and wet gas. The HC/TOC ratio reaches to 15.88%-18.4% that closes to the liquid hydrocarbon-producing rate of source rock with Type II kerogen,which indicates high potential of hydrocarbon generation in the Jurassic source rock.

关 键 词：阿姆河盆地 阿姆河右岸 侏罗系 海相地层 烃源岩 生烃潜力 油源对比 有机质类型 

分 类 号：TE122.113[石油与天然气工程—油气勘探] TE122.114