摘要
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。
On the basis of analyzing comprehensively the geochemical characteristics and formation conditions of the biogas in Shizigiu formation of Pliocene(N 2 3)in middle east Chaidamu Basin and its source rocks,and in combination with the biogas origin simulation test results,the resource potential and exploration prospects for the biogas in such an interval are determined by use of the basin simulation system in the paper Through researching it is indicated that the methane content in the gas sample collected from N 2 3 is 98.01 %;the ethane and propane content is very slight;and the δ 13 C 1 and δ 13 C CO 2 are-67.3‰ and-13.7‰ respectively;so it shows a biogas feature In the case of N 2 3,a stable and fast sedimentation/subsidence,cold climatic conditions and high salinity water environment provided some favorable conditions for the biogas gas'being generated in it;the main types of organic matters in it are TypeⅡ 2(sapropelic humic type)and Type Ⅲ(humic type);and its organic carbon content is relatively high,being 0.36%(average value).Basin simulation results indicate that in N 2 3,biogas generation intensities are(1500 ～ 9000)×10 6m 3/km 2 in general and the biogas resources estimated primarily are 426.7×10 9m 3, therefore the biogas resource potential is relatively abundant in this region In 2001,a commercial gas flow was found out in N 2 3 for the first time in well Yishen―1 drilled in Yikeyawuru structure in this region;and forecast reserves of 29.5×10 9m 3 were reported to the leadership;which shows good exploration prospects
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第1期13-16,共4页
Natural Gas Industry
基金
国家重点基础研究发展规划项目 (G1 9990 4 3 3 1 0 )
国家自然科学基金项目 ( 4 0 0 72 0 5 0
4 0 2 72 0 6 5 )
中国科学院知识创新工程重要方向项目 (KZCX3 -SW - 1 2 8)资助
