>> 自然科学版期刊 >> 2017年02期 >> 正文
南华北盆地太原组碳酸盐岩烃源岩地球化学特征
供稿: 曹高社;刘慧慧;邢舟;徐光明 时间: 2018-11-21 次数:

作者:曹高社刘慧慧;邢舟徐光明

作者单位:河南理工大学资源环境学院中原经济区煤层(页岩)气河南省协同创新中心

摘要:为明确南华北盆地太原组碳酸盐岩烃源岩基本特征,并分析该套烃源岩特殊的有机质富集背景,选取南华北盆地周缘洛阳、禹州、平顶山和永城地区全取心煤炭钻井的太原组碳酸盐岩样品进行系统的有机化分析,并对其进行评价,在对太原组碳酸盐岩矿物学和沉积环境分析的基础上,揭示该套烃源岩有机质富集背景。南华北盆地不同地区太原组碳酸盐岩烃源岩的有机碳平均值均大于1.00%,但生烃潜量和氯仿沥青"A"均较小,平均值分别小于1.00 mg/g和0.01%。干酪根有机显微组分以镜质组为主,一般占50%以上,壳质组一般在20%~50%,惰质组少量,但几乎不含腐泥组。镜质体反射率(Ro)在不同地区差异较大,洛阳地区Ro平均值为4.57%,禹州地区Ro为2.1%,平顶山地区Ro为1.14%,永城地区Ro平均值为1.97%。南华北盆地太原组碳酸盐岩烃源岩与普遍的碳酸盐岩烃源岩差异较大。太原组灰岩中较高的有机质含量主要与其中含有大量的炭屑有关,其原因是突发性海侵形成的灰岩过程中对下伏的煤线或碳质泥岩造成强烈冲刷。

基金:全国油气资源战略选区调查与评价项目(1211302108023-2);

关键词:太原组;碳酸盐岩;烃源岩;南华北盆地;

DOI:10.16186/j.cnki.1673-9787.2017.02.007

分类号:P618.13

Abstract:In order to clarify the essential features of the carbonate source rocks of Taiyuan Formation in Southern North China Basin and analyze the special background of the organic matter enrichment in these source rocks, through selecting the carbonate source rocks of Taiyuan Formation samples from full-coring coal boreholes in Luoyang area, Pingdingshan area and Yongcheng area at the edge of the Southern North China Basin, it was systematically analyzed and evaluated the samples, and it is revealed the organic matter enrichment background of these source rocks on the basis of the mineralogical analysis and the sedimentary environment analysis of the carbonate source rocks of Taiyuan Formation.The mean organic carbon contents are all greater than 1.00% in Taiyuan Formation source rocks in different areas of the Southern North China Basin, however, the contents of the generating hydrocarbon potential and chloroform bitumen “A”is relatively smaller, the mean contents are smaller than 1.0 mg/g and 0.01% separately.The main organic microstructure composition of kerogen in these source rocks is vitrinite, and it is generally more than 50%, while exinite is usually between 20% and 50%.Inertinite is a little, and sapropelinite is rarely contained.The vitrinite reflectances (Ro) have large differences in different districts, and the mean values of Roare respectively 4.57%, 2.1%, 1.14% and 1.97% in Luoyang area, Yuzhou area, Pingdingshan area and Yongcheng area.The carbonate source rocks of Taiyuan Formation in the Southern North China Basin not only have greatly different from common marine carbonate source rocks' features.The higher organic content of Taiyuan Formation limestone is mainly related with the large amounts of carbon dust, and the reason is related to the strong erosion to the underlying coal bed or carbonaceous mudstone by the limestone which was formed by sudden transgression.

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