中国陆表海碳酸盐岩有机质的生烃潜力

doi:10.11743/ogg20010401

摘要/Abstract

摘要：

有机质类型指标中反映母质来源的指标并不能完全代表生烃能力的大小.目前积累的大量分析数据表明,许多地区沉积的贫有机质海相碳酸盐岩O/C原子比H/C原子比落在干酪根类型图上的Ⅲ型区域,同一套地层中碳酸盐岩干酪根H/C明显低于泥岩,碳酸盐岩干酪根镜检可发现无定形组微粒化、藻类体出现黑心结构、存在大量类似镜质组的显微组分,均表明其有机质生烃降解率很低(只相当于Ⅲ型干酪根),这是氧化的沉积环境对有机质改造的结果,符合有机相的分布规律.在研究其生烃数量与机制时,不宜采用有机碳丰度很高、原始降解率很高的低成熟泥灰岩的模拟实验结果.

关键词: 碳酸盐岩, 有机质类型, 有机相, 有机碳, 生烃潜力

Abstract:

The indices reflecting the origin of parent materials in organic matter types can not completely represent hydrocarbon generation ability.However,many geochemical indices indicate that the hydrocarbon potential of the epicontinental marine carbonate rocks is rather low.The ratioes of H/C and O/C of kerogens in these carbonate rocks are plotted in the area of type Ⅲ kerogens in the van Krevelen chart.The H/C ratio of kerogen in carbonate rocks is much lower than that in the neighboring mudstone.Maceral observation also indicates the poor hydrocarbon generation potential of OM in epicontinental carbonate rocks,including the converting of amorphous liptinite to micrinite,the occurrence of blakc structures in the center of algainite and large amount of maceral alike to vitrinite.The distribution of organic facies can explain the transformation of the OM in these carbonate rocks by oxidizing condition.The hydrocarbon generation potential of the sapropelic OM in the epicontinental carbonates is only equivalent to that of type Ⅲ kerogen .When studying the hydrocarbon generating amount of this type of carbonate rocks in basin simulation,they should not be represented by the low mature marls with high TOC and high hydrocarbon index.

Key words: carbonate rock, organic facies, type of organic matter, organic carbon,hydrocarbon generation potential

中图分类号:

TE122.1⁺15

夏新宇,曾凡刚,洪峰. 中国陆表海碳酸盐岩有机质的生烃潜力[J]. 石油与天然气地质, 2001, 22(4): 287-292. doi: 10.11743/ogg20010401 Xia Xinyu,Zeng Fangang,Hong Feng. HYDROCARBON-GENERATING POTENTIAL OF ORGANIC MATTER IN EPICONTINENTAL SEA CARBONATE ROCKS IN CHINA[J]. Oil & Gas Geology, 2001, 22(4): 287-292. doi: 10.11743/ogg20010401

参考文献

[1] 傅家谟,秦匡宗.干酪根地球化学[M].广州:广东科技出版社,1995.619～628
[2] 周中毅,贾蓉芬.碳酸盐岩生油岩的有机地球化学、岩石学特征[J].地球化学,1974,(4):278～298
[3] 傅家谟,汪本善,史继扬,等.有机质演化与沉积矿床成因(Ⅰ)--油气成因与评价[J].沉积学报,1983,1(3):50～57
[4] 傅家谟,贾蓉芬.碳酸岩分散有机质的基本存在形式、演化特征与碳酸岩地层油气评价[J].地球化学,1984,(1):1～9
[5] 刘宝泉,梁狄刚,方杰,等.华北地区中上元古界、下古生界碳酸盐岩有机质成熟度与找油远景[J].地球化学,1985,(2):150～162
[6] 包建平,王铁冠,王金渝,等.下扬子地区海相中、古生界有机地球化学[M].重庆:重庆大学出版社,1996.17～18
[7] 郜建军,李明宅.我国海相碳酸盐岩的有机相及其生油气潜力[A].见:地质矿产部石油地质研究所.石油与天然气地质文集(第四集)[C].北京:地质出版社,1995.65～77
[8] 杨俊杰,裴锡古.中国天然气地质学(卷四)[M].北京:石油工业出版社,1996.101～102
[9] Jones R W.Organic facies [A].In:Brooks J,Welte D.Advances in petroleum geochemistry(Vol.2)[C].London:Academic Press,1987.1～90
[10] Durand B.Kerogen[M].Paris:Edition Technip,1980.123～138
[11] 钟宁宁,秦勇.碳酸盐岩有机岩石学[M].北京:科学出版社,1995.58～65
[12] 赵孟军,张宝民,肖中尧,等.塔里木盆地奥陶系偏腐殖型烃源岩的发现[J].天然气工业,1998,18(5):32～36
[13] McKirdy D M,Kantsler A J,Emmett J K,et al.Hydrocarbon genesis and organic facies in cambrian carbonates of the Eastern Offices Basin,South Australia[A].In:Palacas J G.Petroleum geochemistry and source rock potential of carbonate rocks[C].Tulsa:AAPG,1984.1～90
[14] 黄第藩,赵孟军,张水昌.塔里木盆地油气资源及勘探方向[J].新疆石油地质,1999,20(3):189～192
[15] 郝石生,高岗,王飞宇,等.高过成熟海相烃源岩[M].北京:石油工业出版社,1996.16～17
[16] 冯增昭,鲍志东,张永生,等.鄂尔多斯盆地奥陶纪碳酸盐岩地层岩石岩相古地理[M].北京:地质出版社,1998.62～73