摘要
系统采集了鄂尔多斯盆地南部镇泾地区中生界的烃源岩、原油及油砂样品,对它们抽提物中的饱和烃馏分进行GC-MS分析,研究饱和烃生物标志化合物组成特征,探讨研究区中生界原油的来源。研究表明:根据姥植比、C30重排藿烷和8β(H)-补身烷相对含量,镇泾地区中生界烃源岩可划分为A1、A2、A3、B 4类,原油可划分为Ⅰ、Ⅱ2类。Ⅰ类原油来自深湖相沉积相带的长7油页岩(A1类),Ⅱ类原油来自深湖—半深湖沉积相带的长7暗色泥岩(A2类)。长7油页岩是鄂尔多斯盆地南部中生界的主力烃源岩,各油层组的原油主要来自该烃源岩。
Samples of the Mesozoic source rocks,crude oils and oil sands from Zhenjing area in the southern Ordos Basin were collected systematically. Gas chromatography-mass spectrometry （GC-MS） was per- formed on the saturated hydrocarbon fractions extracted from these samples in order to discuss their bio- marker characteristics and the origin of Mesozoic crude oils. The results show that, on the basis of biomark- er source parameter distribution,the Mesozoic source rocks in Zhenjing area can be divided into four types （A1 ,A2 ,Aa and B）,and crude oils can be grouped into two types （ I and lI ）. Type I crude oils should be derived from Chang 7 oil shales that deposited in reducing,deep lacustrine environment. Type ]I crude oils should be sourced from Chang 7 dark mudstones laid down in a sub-reducing to reducing, deep or semi-deep lacustrine environment. Apparently,oil shales in Chang 7,as the main source rocks in the southern Ordos Basin,contributed predominately to the crude oils in this area.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2013年第3期604-611,共8页
Natural Gas Geoscience
基金
国家重大专项基金"鄂南低渗油藏成藏模式与勘探目标评价"(编号:2011ZX05002-001-003)
中国石化专项基金"鄂南中生界生烃条件及油源对比研究"(编号:G13KJ-11-ZS-QT-ZJ-0005)联合资助
