高演化海相碳酸盐岩烃源岩的多元统计分析  

MULTIVARIATE STATISTICAL ANALYSIS OF HIGHLY-MATURE MARINE CARBONATE SOURCE ROCKS

作　　者：腾格尔[1] 刘文汇[1] 徐永昌[2] 陈践发[3] 

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所 [2]中国科学院地质与地球物理研究所气体地球化学重点实验室 [3]中国石油大学

出　　处：《天然气工业》2007年第10期33-37,41,共6页Natural Gas Industry

基　　金：国家重点基础研究发展规划"973"项目(编号:2001CB209102;G1999043306);中国石化股份有限公司科技项目(编号:P04040)的资助

摘　　要：我国海相油气勘探中,碳酸盐岩烃源岩评价方法的研究仍是当前亟待解决的关键问题之一。为此,通过对鄂尔多斯盆地下古生界多项无机与有机参数的多元统计分析,得出了TOC、Cu、Zn、Mo、P、Ba及V/(V+Ni)、Th/U、Zr/Rb、Rb/K、δ13Corg、δ13C等指标对高演化海相碳酸盐岩烃源岩发育主控因素的示踪具适用性、代表性的认识;利用其组合对研究区下古生界古环境的恢复表明,区内存在两种利于有机质富集和烃源岩发育环境,即低能、缺氧的半封闭性斜坡环境和局限盆地、潟湖环境。西缘克里摩里组形成于前一类环境,可视为潜在有效烃源岩。针对我国海相碳酸盐岩烃源岩的特殊性,更需加强多元、动态、综合分析研究,通过对可能烃源岩层位的现今地质特征的综合研究,能够反演烃源岩发育环境,进而开展现今与历史相结合的多元、动态评价研究。Research of evaluation methodology of carbonate source rocks is still a bottleneck in marine petroleum exploration in China at present.Multivariate statistical analysis of various organic and inorganic parameters of the Lower Paleozoic in the Ordos Basin shows fhat it is applicable and representaiive to trace the major control factors of the highly-mature marine carbonate source rocks with various indexes such as TOC,Cu,Zn.Mo,P and Ba,as well as V/(V+Ni).Th/U,Zr/Rb,Rb/K,δ13Corg and δ13C etc.Various combinations of these indexes are used to reconstruct the palaeoenvironment of the Lower Paleozoic in the study area and the results show that there existed two kinds of environments favorable for the enrichment of organic maters and development of source rocks in the study area,i.e.semi-closed anoxic siope with low energy and confined lagoon.The Kelimoli Formation on the western margin was deposited on the semi-closed anoxic slope with low energy and can be viewed as potentially effective source rocks.In view of the characteristics of the marine carbonate source rocks in China,multivariate,dynamic and comprehensive research should be strengthened.The sedimentary palaeoenvironment of the source rocks should be recognized through comprehensive study of current geologic features of possible source intervals,and multivariate and dynamic evaluation of source rocks should be carried out through combining current data with historical data.

关 键 词：鄂尔多斯盆地 早古生代 碳酸盐岩 烃源岩 发育环境 有机 无机 参数 多元 统计 

分 类 号：P618.13[天文地球—矿床学]