漠河盆地漠河组天然气水合物潜在气源岩评价  

Evaluation of Potential Gas Source Rock of Gas Hydrate in Mohe Formation,the Mohe Basin

作　　者：邓磊[1,2] 文志刚[2] 刘蕴[3] 董纹希 刘聪[3] 

机构地区：[1]长江大学工程技术学院,湖北荆州434020 [2]长江大学,湖北武汉430100 [3]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《特种油气藏》2015年第5期33-37,152,共5页Special Oil & Gas Reservoirs

基　　金：中国地质调查局国家海洋地质专项"东北冻土天然气水合物资源勘查"(2014GZH-003-24-5);中国地质调查局项目"中国中东部构造体系控油作用研究"(1212011120965);长江大学工程技术学院科学研究发展基金项目"漠河盆地中侏罗统天然气水气物气源岩研究"(15j0101)

摘　　要：通过对钻井及露头剖面样品的分析,基于烃源岩的分布及有机质的丰度、类型、成熟度等指标,对漠河盆地漠河组天然气水合物潜在气源岩进行了深入剖析与有效评价,以期为该区天然气水合物的勘探提供理论依据。结果表明:漠河组分布稳定且连续,暗色泥岩沉积厚度大,由西至东逐渐减薄;总有机碳含量平均为1.85%,其中71.38%的样品被评价为中等及以上烃源岩;有机质类型以Ⅱ1、Ⅱ2型为主,少量为Ⅰ型;有机质热演化程度均已达到高成熟—成熟阶段。结合烃源岩厚度、丰度、类型及演化程度等特征将天然气水合物有利区划分为3类,龙河林场一带烃源岩沉积厚度大、丰度高、类型好、热演化程度高,可作为下一步勘探的首选目标区。Through the analysis of drilling and outcrop samples,based on the distribution of hydrocarbon source and the abundance,rock maturity,type and other indicators of organic matter,the in- depth analysis and effective evaluation of potential source rocks of natural gas hydrate in Mohe Formation of the Mohe Basin was made in order to provide the theoretical basis for the exploration of gas hydrate in this area. Results show that the distribution of Mohe Formation is stable and continuous with large sedimentary thickness of mudstone,thinning down from west to east. The total organic carbon content averages at 1. 85%,in which,71. 38% of the samples from hydrocarbon source rock were assessed as medium and quality source rocks; organic matter was mainly type Ⅱ1 and Ⅱ2,and with a small amount of type I; thermal evolution of organic matter have reached a high level of maturity- maturity stage. Combined with the thickness,abundance,types and evolution of the hydrocarbon source rock,favorable zones of natural gas hydrate have been classified into 3 categories. Source rock around the Longhelingchang belt was featured by large sedimentary thickness,high abundance,good type and high thermal evolution,which can be the first target for further exploration.

关 键 词：漠河盆地 漠河组 天然气水合物 烃源岩 有机质 

分 类 号：TE122.1[石油与天然气工程—油气勘探]