收稿日期: 2014-03-11
修回日期: 2014-05-13
网络出版日期: 2015-01-10
基金资助
中国石油天然气股份有限公司科技项目(编号:2013E-050204);国土资源部油气资源评价及矿业权管理支撑系统建设专项(编号:1A14YQKYQ0102)联合资助.
The Cause of Ultra Deep-seated Oil and Gas of Paleogene in Baxian Sag
Received date: 2014-03-11
Revised date: 2014-05-13
Online published: 2015-01-10
霸县凹陷古近系超深层(4 500m以深)原油及天然气有机地球化学分析发现，原油密度在0.77～0.83g/cm3之间，属于轻质油—挥发油，天然气中甲烷含量低于90%，表现出湿气特征。饱和烃色谱、色质及碳同位素特征分析油气来源为深层Es4烃源岩，但Es4原油明显含有奥利烷、甾烷C29>C27，而天然气碳同位素组成较轻，δ13C2<-32‰为油型气特征，潜山原油不含奥利烷、甾烷C27>C29，而天然气碳同位素组成明显偏重，δ13C2>-25‰，显示出典型的煤成气特征，反映出Es4原油和潜山天然气与偏腐殖型烃源岩较类似，而Es4 天然气和潜山原油与偏腐泥型烃源岩较类似。油气源对比结果与近年来对霸县Es4烃源岩非均质性研究成果相对应。牛东1井超深潜山天然气C1/C2值为13，C1/C3值为37，干燥系数达到94.9%，3MD+4MD金刚烷含量在35.4～37.9μg/g之间，表明其来源为高成熟阶段高气油比流体直接充注形成，而非生油窗阶段原油裂解成因。在说明超深层油气来源及成因的同时，证明超深层仍有极大的勘探空间。
王建，王权，师玉雷，马学峰，钟雪梅，李向阳，王飞宇 . 冀中坳陷霸县凹陷古近系超深层油气成因分析[J]. 天然气地球科学, 2015 , 26(1) : 21 -27 . DOI: 10.11764/j.issn.1672-1926.2015.01.0021
According to the organic geochemical analysis of the ultra deep-seated oil and gas of Paleogene in Baxian Sag,the crude oil density is in the range of 0.77 to 0.83g/cm3.The oil shows wet gas feature,and methane content of natural gas is under 90%,belonging to light-oil -volatile oil.The analysis of gas chromatographic of the saturated hydrocarbon,GC-MS and the carbon isotopes indicate that oil-gas are derived from the 4th member of Shahejie Formation source rocks.The crude oil in the 4th member of Shahejie Formation obviously contains oleanane,sterane C29>C27,low gas isotope(δ13C2value lower than -32‰ is oil type gas).However,buried-hill oils contain sterane C27>C29 but no oleanane.The gas isotope is high,which is a typical feature of coal-formed gas,i.e.,δ13C2value is more than -25‰.The crude oil of the 4th member of Shahejie Formation and the gas in buried-hill were rather similar to the humic source rock,while natural gas in the 4th Member of Shahejie Formation and crude oil in the buried-hill are more similar to the sapropelic source rock.Oil-source correlation results are corresponding to the research on source rock heterogeneity of the 4th member of Shahejie Formation in the Baxian Sag in recent years.The C1/C2 of natural gas in Niudong 1 ultra-deep buried hill was 13, C1/C3 is 37,dryness coefficient reaches 94.9%,and the concentration of diamondoid of 3MD and 4MD is in the range of 35.4 to 37.9μg/g.It is indicated that the gas derived from high maturation phase and high GOR fluid charged directly,rather than genetic of oil-cracking in oil-generating window phase.Accounting for petroleum source and cause of ultra deep oil simultaneously,it is concluded that ultra deep formation still has tremendous exploration prospects.
Key words： Baxian Sag; Ultra deep formation; Diamondoid; Origin of gas
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