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车排子凸起西翼轻质原油来源分析
王千军,陈林,曹忠祥,张曰静,商丰凯,任新成
0
(1.中国石化胜利油田分公司勘探开发研究院,山东东营257015;2.中国石化胜利油田分公司,山东东营257001)
摘要:
车排子凸起西翼紧邻四棵树凹陷,前期认为该区轻质油油藏主要来自侏罗系烃源岩。通过对多个层系已发现的原油和四棵树凹陷主要烃源岩的生物标志化合物、原油碳同位素、原油成熟度等地化指标进行综合对比分析,明确研究区轻质原油来源,并建立综合判识标准。研究区轻质原油可分为2类,Ⅰ类原油主要分布于石炭系、侏罗系、白垩系、古近系,具有规则甾烷C27,C28,C29呈反“L”型、伽马蜡烷含量低、Pr/Ph值较大、原油碳同位素较重、原油成熟度相对较高的特征,其生油母质形成于弱氧化-弱还原淡水湖沼环境中,有机质来源以高等植物为主,主要来自四棵树凹陷侏罗系八道湾组烃源岩;Ⅱ类原油主要分布于沙湾组,具有规则甾烷C27,C28,C29呈“V”字型、伽马蜡烷含量相对较高、Pr/Ph值较小、原油碳同位素较轻、原油成熟度相对较低的特征,其生油母质形成于强还原的半咸水深湖相环境中,有机质来源以浮游藻类为主,主要来自古近系安集海河组烃源岩。进一步证实四棵树凹陷发育侏罗系和古近系2套有效烃源岩,且其生成的油气已经发生长距离运移。
关键词:  轻质油  生物标志物  油源对比  车排子凸起西翼  四棵树凹陷  准噶尔盆地
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.003
基金项目:国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002),中国石化重大科技项目“石炭系领域油气成藏规律及目标评价”(P17001-4)。
Hydrocarbon source analysis of light oil reservoirs in west wing of Chepaizi Uplift
WANG Qianjun,CHEN Lin,CAO Zhongxiang,ZHANG Yuejing,SHANG Fengkai,REN Xincheng
(1.Exploration and Development Research Institute of Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;2.Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)
Abstract:
The western wing of Chepaizi Uplift is next to Sikeshu Sag. In the early stage,it was believed that the hydrocarbon in light oil reservoirs in this area were mainly from the Jurassic source rocks. Through comprehensive analysis of the geochemical indicators,such as the biomarker compounds,carbon isotope,maturity of the crude oil discovered in multiple strata and the main source rocks in Sikeshu Sag,it was discovered that the light oil in the study area could be divided into two types,the source of light oil was clarified and the comprehensive criterion for identifying the crude oil was established.The results show that TypeⅠcrude oil mainly distributes in C,J,K,E formation,which has the characteristics of regular sterane C27-C29 in shape of“inverted L”,low levels of γ-cerane,high Pr/Ph,weight carbon isotope and relatively high maturity,and its parent material was formed in the environment of weak oxidization-weak reduction freshwater lake,and the source of organic matter was mainly higher plants,and TypeⅠcrude oil was mainly from the source rock of J1b Formation in Sikeshu Sag. While TypeⅡcrude oil mainly distributes in the N1s with regular sterane C27–C29 in shape of“V”,high levels of γ-cerane,smaller Pr/Ph,lighter carbon isotope and relatively low maturity of crude oil,and its parent material was formed in the environment of strongly reduced brackish water deep lacustrine,and the source of organic matter was mainly planktonic algae,and TypeⅡcrude oil was mainly from the source rock of the Paleogene E2-3a Formation. The research results further confirm that two sets of effective source rocks,Jurassic and paleogene,have been developed in Sikeshu Sag,and the oil and gas generated by them have been transported for a long distance.
Key words:  light oil  biomarker  oil-source correlation  west wing of Chepaizi Uplift  Sikeshu Sag  Junggar Basin

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