低丰度高演化海相碳酸盐烃源岩有机质原生性研究  

The Study on Indigenous Characteristics of Organic Matter in Marine Carbonate Hydrocarbon Source Rock with Low Abundance and High Evolution

作　　者：李延钧[1] 陈义才[1] 徐志明[1] 吕强[2] 石晓英 左智峰[2] 

机构地区：[1]西南石油学院,四川南充637001 [2]长庆石油勘探局,西安710021

出　　处：《沉积学报》2000年第1期146-150,共5页Acta Sedimentologica Sinica

基　　金："九五"国家重点科技攻关二级专题 !( 96 110 0 4 0 4 0 2 )

摘　　要：碳酸盐烃源岩有机质原生性直接影响到其生烃能力的客观评价 ,特别对于低丰度高演化海相碳酸盐烃源岩生烃能力评价的影响尤为严重。文章阐述了碳酸盐岩的普遍存在运移沥青 ,以及识别烃源岩有机质原生性的各种方法 ,并以鄂尔多斯盆地下古生界为例 ,建立了一套适合于低丰度高演化海相碳酸盐烃源岩有机质原生性识别的有效方法。The indigenous characteristcs of organic matter in carbonate hydrocarbon source rock directly influences the precise evaluation of its hydrocarbon generation capability especially on marine carbonate rock with low organic matter abundance and high thermal evolution.The paper discusses that migration bitumen distribute widely in carbonate hydrocarbon source rock,meanwhile,all methods to distionguish primary or secondary organic matter in rocks are introduced in this paper.Finally,a series of measures to determine indigenous characteristics of organic matter carbonate source rock are proposed on the basis of the analyses of carbonate source rock of Lower Paleozoic in Ordos Basin. The so-called recognition of indigenous characteristics of hydrocarbon sources rock deals with two aspects:the first is the recognition of indigenous characteristics of organic matter so as to distinguish sources rock and reservoir and then determine the effective sources rock.The second is the recognition of indigenous characteristics of geochemical parameters and firsthand information so as to choose them which could really reflect the characteristics of sources rock. The carbonate rock has the dual propertes of source rock and reservoir,and the later alteration and tectonic action could make it become reservoir,especially the tectoclass or microcracks usually being the migration route or the detained space of bitumen,this phenomenon is widely distributed in the high-over mature carbonate source rock ,such as Sichuan Basin,Tarim Basin and Eerduosi Basin.The existence of migration bitumen will result in three kinds of influence on the evaluation of capability of hydrocarbons generation of organic matter in carbonate rock:First,the content of organic matter tends to be high.Second,maturation of organic matter is difficult to be determined and evaluated.In addition,it is difficult to determine the type and quality of organic matter.Therefore,the recognition of indigenous characteristics of organic matter in carbonate rock is the basis and

关 键 词：海相 碳酸盐烃源岩 有机质原生性 油气运移 

分 类 号：P618.130.1[天文地球—矿床学] P618.130.2[天文地球—地质学]