石油实验地质2017，Vol.39Issue(1)：99-105,7.DOI:10.11781/sysydz201701099
黔北坳陷小草坝古油藏储层沥青成因及演化
Genesis and evolution of reservoir bitumen in Xiaocaoba paleo-oil reservoir, Qianbei Depression
摘要
Abstract
The solid bitumen in the Xiaocaoba paleo⁃oil reservoir of Devonian in the Qianbei Depression fills so⁃lution caves, intracrystalline pores and fractures of dolomites containing biodetritus. The solid bitumen, with an equivalent Ro of 4.08%-4.14%, hardly dissolves in organic solvent. The n⁃alkanes have a high n⁃C21-/n⁃C22+value at the range of 1. 5-9. 0. Most bitumen samples have a higher abundance of cheilanthanes relative to ho⁃panes, and also a relatively higher abundance of C21⁃pregnane and C22⁃pregnane relative to C27-29⁃sterane. The bitumen and bitumen inclusions do not fluoresce, and the bitumen has no absorption peaks of aliphatic series⁃containing groups or oxygen⁃containing groups in the infrared spectrum. The physical, optical and geochemical characteristics of bitumen indicate that it formed in the process of thermal cracking under high temperature. The sterane and terpane parameters and theδ13 C of the bitumen are obviously different from those of sources rocks in the Cambrian Qiongzhusi Formation and Silurian Longmaxi Formation. But theδ13 C of the bitumen are very close to that of the Upper Paleozoic sources rocks, indicating that the bitumen derived from these source rocks. Ancient oil reservoirs are interpreted to have been trapped in the Middle-Late Triassic period. The bitumen formed in the Early Cretaceous period while oil reservoirs were deeply buried and then uplifted to ground level in the Yan⁃shanian and Himalayan periods.关键词
沥青成因/沥青演化/储层沥青/古油藏/泥盆系/黔北坳陷Key words
bitumen origin/bitumen evolution/reservoir bitumen/ancient oil reservoir/Devonian/Qianbei Depression分类
能源科技引用本文复制引用
张润合,斯春松,黄羚,包建平,马立桥,王鹏万,鲁慧丽,蒋兴超..黔北坳陷小草坝古油藏储层沥青成因及演化[J].石油实验地质,2017,39(1):99-105,7.基金项目
中国石油天然气股份有限公司科技项目（2012B－0504）资助。 （）
