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文章主要是对柴达木盆地中东部地区上第三系狮子沟组 (N2 3)生物气及其源岩地球化学特征、形成条件进行综合分析 ,并结合生物气成因模拟实验结果 ,利用盆地模拟系统 ,确定该层段生物气资源潜力 ,明确勘探前景。研究表明 ,狮子沟组气样组分中甲烷含量为 98.0 1 %,乙烷和丙烷含量极低 ,δ1 3C1 值为 - 6 7.3‰ ,δ1 3CCO2 值为 - 1 3 .7‰ ,为生物气的特征 ;而N2 3层段稳定快速的沉积 /沉降、沉积时寒冷的气候条件和高盐度的水体环境为生物气的形成提供了有利条件 ,其有机质类型以Ⅱ2 (腐泥腐殖型 )和Ⅲ (腐殖型 )型为主 ,有机碳含量相对较高 ,平均为 0 .3 6 %;盆地模拟结果表明本区N2 3层段生物气生气强度一般为 ( 1 5 0 0～ 90 0 0 )× 1 0 6m3/km2 ,初步估算生物气地质资源量为 4 2 6 7× 1 0 8m3。 2 0 0 1年在本区的伊克雅乌汝构造钻探伊深 1井 ,于N2 3层段首次获得生物气工业气流 ,并上交预测储量 2 95× 1 0 8m3,展示了良好的勘探前景。
In this paper, the geochemical characteristics and formation conditions of biogas and source rocks of the Shizigou Formation (N2 3) of the Tertiary in the central and eastern regions of the Qaidam Basin are comprehensively analyzed. Combining with the genesis simulation results of biogas, System to determine the potential of biogas resources in this interval and to clarify the prospect of exploration. The results show that the gas composition of the Shizigou Formation is 98.0 1% with very low contents of ethane and propane, δ1 3C1 value of -6.33% and δ1 3CCO2 value of -1.37 ‰, The characteristics of biogas formation are stable and fast deposition and deposition in the N2 layer, favorable climatic conditions during cold deposition and high salinity water environment. The organic matter types are characterized by Ⅱ2 (sapropel humic type) and Ⅲ (humic type), with relatively high content of organic carbon (average 0.36%). The results of basin modeling show that the biogas intensity of N2 3 in this area is generally (1500 ~ 9000) ) × 106m3 / km2. The preliminary estimation of the biogas geological resources is 4 2 6 7 × 1 0 8m3. In 2001, the Ekyaurou Formation in this area drilled the Yshen-1 well and obtained the first biogas industrial gas flow on the 3rd and 3rd strata of N2 and turned over the predicted reserve of 2 95 × 1 0 8 m3 to show a good exploration prospect .