The application of microbial exploration technology to the oil and gas survey of Chaoshan depression
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摘要:
东沙海域潮汕坳陷中生界研究程度相对较低，油气分布规律不明，为了加强对该区油气分布和富集规律的研究，针对潮汕坳陷西部地质目标首次应用微生物地球化学勘探技术（MGCE），探讨其含油气性。MGCE技术以轻烃微渗漏理论为基础，采用地质微生物学方法和地球化学方法检测研究区海底表层的微生物异常和吸附烃异常，预测研究区下伏地层中油气的富集区及其油气性质。检测结果显示研究区西部凹陷的斜坡区微生物异常呈块状发育，轻烃微渗漏强度变化大，可能为潜在油气富集区，酸解吸附烃成果显示可能的油气性质为干气和凝析油气。
Abstract:Oil and gas exploration of Mesozoic strata in Chaoshan depression of Dongsha sea area is believed to have good prospect. Because of its low exploration and study level caused by the limitation of seismic data, oil and gas distribution there is unknown. In order to strengthen the research on the distribution and enrichment of oil and gas in the west of Chaoshan depression, the authors first applied microbial hydrocarbon detection technology to study its oil-bearing property of geological targets. Based on the theory of light hydrocarbon microseepage, the authors used the method of geological microbiology and geochemistry directly detect the anomaly of microbes and adsorbed hydrocarbons on the surface of the study area, and predicted the enrichment area of oil and gas in the underlying strata of the study area as well as its oil or gas properties. The results of microbial hydrocarbon detection show that microbiological anomaly is massively developed in the slope area of the western depression, suggesting that the intensity of light hydrocarbon micro seepage is relatively large in the study area, and there may be oil and gas enrichment zone. Acidolysis hydrocarbon analysis shows possible existence of oil and gas properties for dry gas and condensate oil and gas. The results of microbial hydrocarbon detection indicate that the Mesozoic strata in the Dongsha sea area has a good potential for oil and gas resources.
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图 1 研究区地理位置及中生代构造区划（a，为研究区地理位置；b，为研究区潮汕坳陷中生代构造区划）
Figure 1. Geographical location of the study area and Mesozoic structure division (a, the geographical location of the study area; b, the Mesozoic structure division of Chaoshan depression in the study area)
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图 2 烃类微渗漏与宏渗漏模式图（据郝纯等，2015修改）
Figure 2. Pattern of microseepage and macroseepage of hydrocarbon (modified from Hao Chun et al., 2015)
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图 4 xq2010地震剖面与微生物值叠合图
Figure 4. Overlap diagram of seismic profile (xq2010) and microbiological abnormal value
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图 5 nhbl152-1-2015地震剖面与微生物值叠合图
Figure 5. Overlap diagram of seismic profile (nhbl152-1-2015) and microbiological abnormal value
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图 6 微生物值和Tj0构造图叠合图
Figure 6. Superposition diagram of microbiological value and structural map of Tj0
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图 7 研究区酸解吸附烃C1/(C2+C3)-C2/(C3+C4)三组分交会图
Figure 7. Three-component cross-plot of acidolysis adsorbed hydrocarbon in the study area
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