哈拉哈塘地区下奥陶统烃源岩发现的地质意义  

The Geological Significance for Discovery of Lower Ordovician Source Rocks in Halahatang Area,Tarim Basin

作　　者：张朝军[1,2] 周新源[2] 王招明[2] 王长勋[2] 罗秀羽[2] 刘云祥[2] 龙维华[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《新疆石油地质》2008年第5期588-590,共3页Xinjiang Petroleum Geology

摘　　要：关于塔里木盆地台盆区的烃源岩问题一直有不同的看法,对奥陶系生油岩层位的认识差别更大。过去由于盆地中西部多数下奥陶统碳酸盐岩样品的有机碳含量低于0.2%,达不到工业性源岩标准,因而中西部下奥陶统的生烃潜力被低估。通过对哈6井下奥陶统鹰山组的实验数据分析,发现大多数样品有机碳含量>0.2%,平均值0.437%,其中厚达130m的含云灰岩有机碳含量几乎全部≥0.5%,首次证实了盆地哈拉哈塘地区下奥陶统发育工业性烃源岩。这套源岩厚度较大,继承性好,推测其分布范围较大,如果和黑土凹组页岩连成一片,将形成巨大的生烃能力。鹰山组有效烃源岩的发现表明,下奥陶统有较大的油气资源潜力,从而拓宽了勘探领域。The controversy on the hydrocarbon source rocks in Tarim cratonic area has not being ceased. There is greater awareness of differences on the source horizon of Ordovician strata in the past because most of organic carbon content of Lower Ordovician carbonate rock samples are less than 0.2% in central and western Tarim basin, which does not reach the industrial standards of source rock. Hence the potential of hydrocarbon generation of Lower Ordovician in this area has been underestimated. Based on the experimental data analysis of Yingshan formation of Lower Ordovician in Ha-6 Well, it is found that the majority of samples of organic carbon content is greater than 0.2%, averaging 0.437%, of which up to 130 m of dolomitic limestone, almost all organic carbon content is greater than 0.5%, first confirming that the Lower Ordovician develops industrial source rocks in Halahatang area. The thickness of souree rocks is larger and well succeeded. And its distribution well be wider if Heituwa shale links it up, and will create huge capacity of hydrocarbon generation. The discovery of Yingshan formation source rocks of high quality indicates that the Lower Ordovician possesses great hydrocarbon potentials, and it will help to broaden the exploration fields.

关 键 词：塔里木盆地 哈拉哈塘 下奥陶统 烃源岩 

分 类 号：TE112.113[石油与天然气工程—油气勘探]