柴东石灰沟地区上石炭统烃源岩评价及潜力分析  

Evaluation and Potential Analysis on Upper Carboniferous Hydrocarbon Source Rocks in Shihuigou Area of the Eastern Qaidam Basin

作　　者：王大华[1,2] 林武[2] 李军亮[2] 柴先平[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中石化胜利油田分公司西部新区研究中心,山东东营257015

出　　处：《石油天然气学报》2013年第8期17-20,0+6+0+5,共4页Journal of Oil and Gas Technology

基　　金：国土资源调查项目(1212011120964)

摘　　要：柴东石灰沟地区发育上石炭统烃源岩,由于缺少系统井下烃源岩评价,其生烃潜力尚不十分明确。对研究区上石炭统烃源岩有机质丰度、类型、成熟度进行分析,结合油源对比及烃源岩展布研究,综合评价其生烃潜力。研究表明,上石炭统海陆过渡相暗色泥岩、碳质泥岩有机质丰度较高,总体达到中等-好烃源岩标准;有机质类型为Ⅱ-Ⅲ型,生烃潜力较大。海相灰岩为较差-中等烃源岩,有机质类型为Ⅰ-Ⅱ型,具备一定生烃能力。研究区上石炭统烃源岩总体处于成熟-高成熟热演化阶段,正处于生排烃高峰期。油源对比分析表明该区石炭系油苗源自石炭系烃源岩,证实了其生烃有效性。同时露头、钻井及前人研究揭示石灰沟地区上石炭统烃源岩分布范围较广、厚度较大,展示该区石炭系可能具有较好的勘探前景。The Upper Carboniferous hydrocarbon source rocks were developed in the Shihuigou area of the eastern Qaidam Basin.Due to the lack of downhole source rock evaluation,its hydrocarbon genetic potential was not yet clear.Based on the analysis of organic matter abundance,type and maturity of downhole hydrocarbon source rocks and combined with oil-source correlation and distribution of source rocks,the hydrocarbon genetic potential was comprehensively evaluated.The results show that dark mudstone and carbonaceous mudstone are relatively high organic matter abundance and belong to moderate-good source rocks,and their organic matter is mainly types Ⅱ and Ⅲ with higher hydrocarbon-generating potential,marine limestone belongs poor-moderate source rock,and its organic matter is mainly types Ⅰ and Ⅱ with certain hydrocarbon-generating potential.Organic matter of upper Carboniferous hydrocarbon source rocks is at the stage of mature to high-mature evolution,it is at the stage of high hydrocarbon generation and expulsion.The oil-source correlation indicates that the crude oil of oil-bearing limestone is generated from Carboniferous hydrocarbon source rocks,it is proven that its hydrocarbon generation is effective.Meanwhile,it is revealed by outcrops and well drilling data and previous study that the upper Carboniferous hydrocarbon source rocks are widely distributed with large thickness in the Shihuigou Area of the eastern Qaidam Basin,it has good prospects for petroleum exploration.

关 键 词：柴达木盆地 石灰沟地区 上石炭统 烃源岩 油源对比 生烃潜力 

分 类 号：P618.13[天文地球—矿床学]