潍北凹陷孔店组烃源岩评价及油源分析

doi:10.11743/ogg20050415

Abstract

Abstract:

Source rocks of various qualities,including very good(with rich organic matters),good,relatively good and relatively poor source rocks,are developed in the 2^nd member of Kongdian Fm in Weibei sag.The source rocks with rich organic matters were deposited in fresh-brackish water of coastal shallow lake under humid subtropical palaeoclimate.Fossils are mainly sporopollen assemblage of angiosperm and gymnosperm,and there are also ostracoda and a few algae.The kerogens are of types , ₂ and ₁ and the lithologies are carbonaceous mudstone and dark grey mudstone,with TOC over 4.5% and chloroform bitumen "A" over 0.17%.Crude oils in Weibei sag can be classified as heavy oil,medium density oil and low density oil,according to their physical properties;and they can also be classified as low-mature oil and mature oil,according to the characteristics of biomarkers.Most of the low-mature oil samples have high pristane/phytane ratio,low gammacerane/C₃₀ hopane ratio and high C₂₉ sterane content.The heavy oil and most of the medium-density oil are of low-mature oil,and oil-to-source correlation show that they have been sourced mainly by the source rocks in the 2^nd member of Kongdian Fm with rich organic matters.Low density oil and some medium density oil are of mature oil,and they have the same oil source as that of low-mature oil.

Key words: organic-rich layer, low-mature oil, mature oil, oil-to-source correlation, Weibei sag

CLC Number:

TE112.1

Song Yitao, Lao Yongsheng, Wang Zhong. Evaluation of source rocks in Kongdian Formation and analysis of oil sources in Weibei sag[J]. Oil & Gas Geology, 2005, 26(4): 487-493.

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Evaluation of source rocks in Kongdian Formation and analysis of oil sources in Weibei sag

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