潍北凹陷烃源岩特征及油源对比分析

Characteristics of Source Rock and Oil-Source Correlation in Weibei Sag

徐昊清

XU Haoqing

中国石油化工股份有限公司胜利油田分公司勘探开发研究院, 山东东营 257015

Exploration and Development Research Institute of Shengli Oilfield Company, SINOPEC, Dongying Shandong 257015, China

以原油和烃源岩饱和烃色谱、色谱-质谱分析为基础，对潍北凹陷孔店组烃源岩的地化特征和源—藏空间对应关系进行了分析。研究表明，孔二段烃源岩是潍北凹陷重要的油气来源，其中孔二上烃源岩有机质丰度最高，品质最好，其次为孔二中烃源岩，它们在伽马蜡烷含量、姥植比和成熟度等指标上存在明显的差异。油源对比结果表明，已发现的孔一段、孔二上亚段的原油主要来源于北部洼陷带的孔二上亚段烃源岩，孔二中亚段原油和孔三段原油来源于北部洼陷带孔二中亚段烃源岩，孔二下亚段烃源岩所生成的原油多为近源成藏。

Based on the analysis of saturated hydrocarbon chromatography and chromatography-mass spectrometry of crude oil and source rocks, the author studied the geochemical characteristics of source rocks in Kongdian Formation and space corresponding relation of source rocks with reservoirs in Weibei Sag. It indicates that the 2nd member of Kongdian Formation is the important source rock of oil and gas. Of which the upper part, with highest abundance of organic matter and superior quality, is the dominant contributor, and the middle part, with significant different in gammacerane content, ratio of pristine/phytane and maturity, acts as the secondary. Oil-source correlation indicates that both of the crude oil discovered in 1st member of and upper part of the 2nd member of Kongdian Formation were sourced from the source rocks of the upper 2nd member of Kongdian Formation in northern sag, and the crude oil from the middle part of the 2nd member or 3rd member of Kongdian Formation were from the 2nd member of Kongdian Formation of the same sag, whereas the oil generated from the lower part of the 2nd member of Kongdian Formation mainly accumulated near source.

https://doi.org/10.3969/j.issn.1008-2336.2016.02.032