EFFECTIVENESS ANALYSIS OF THE OIL AND GAS GEOCHEMICAL EXPLORATION INDICATORS OVER A KNOWN HYDROCARBON RESERVOIR-A CASE STUDY FROM A SUBTLE FAULT BLOCK OIL RESERVOIR IN LINNAN AREA, THE BOHAI BAY BASIN
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摘要: 油气化探指标有效性包括化探指标地球化学场的稳定性、化探异常指示油气藏的有效性及化探异常的重现性。根据渤海湾盆地济阳坳陷临南地区某已知断块隐蔽油藏上方不同批次样品的酸解烃、顶空气、蚀变碳酸盐等化探指标的跟踪研究,研究区内酸解烃甲烷、酸解烃重烃和蚀变碳酸盐指标存在稳定的地球化学场,顶空气甲烷和顶空气重烃指标地球化学场的稳定性弱于酸解烃甲烷、酸解烃重烃和蚀变碳酸盐指标;该断块隐蔽油藏的主要有效化探指标是酸解烃甲烷和蚀变碳酸盐指标,顶空气甲烷是次要有效化探指标。探讨了断层在该油气藏地质系统中特殊的地质作用及其对主要有效化探指标酸解烃甲烷异常空间展布规律的影响,确定了测区酸解烃甲烷指标的块状环形异常模式。Abstract: The effectiveness of the oil and gas geochemical exploration indicators includes the stability of the geochemical field of the indicators,the efficiency of the indicators in reflecting the underground oil and gas,and the reproducibility of the geochemical anomalies.A follow-up study of the geochemical indicators over a subtle fault block oil reservoir in Linnan area,the Bohai Bay Basin,including acid-extraction hydrocarbon,headspace hydrocarbon and alteration carbonate,has been conducted.The results show that the geochemical indicators of the acid-extraction methane,the heavier acid-extraction hydrocarbons,and the alteration carbonate have stable geochemical field in the study area;whereas the geochemical fields of both the headspace methane and the heavier headspace hydrocarbons are less stable.The study also indicates that the acid-extraction methane and the alteration carbonate are the main effective geochemical indicators above the subtle fault block oil reservoir,while the headspace methane is the minor effective geochemical indicator.The special geological role of faults in the oil reservoir geolo-gical system and the effect of faults on the anomaly distribution regularity of the acid-extraction methane have been discussed,and the halo anomaly pattern of this geochemical indicator has been determined over the subtle fault block oil reservoir.
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Key words:
- geochemical indicator /
- effectiveness /
- anomaly pattern /
- geochemical exploration /
- Linna area /
- the Bohai Bay Basin
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