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Characteristics and geochemical implications of light hydrocarbons from ultra-deep Ordovician oils in the North Shuntuoguole area, Tarim Basin

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Frontiers of Earth Science 2022年第3期16卷 623-634页

作者： Li DONG Anlai MA Huixi LIN Lu YUN Weilong PENG Xiuxiang ZHU Petroleum Exploration and Production Research Institute SinopecBeijing 102206China Northwest Oilfield Company SinopecUrumqi 830011China

The ultra-deep Ordovician reservoirs in North Shuntuoguole Oilfield(or Shunbei Oilfield)of Sinopec have achieved annual production of one million ton,and the oil&gas in different faults show different physical properties and fluid phases.In this study,the 28 oil samples from the ultra-deep Ordovician were analyzed using whole oil chromatography.The heptane and isoheptane values of the oil samples were in the range of 29.79%‒46.86%and 1.01%-3.06%,respectively,indicating the oils are high mature.The maturity that calculated based on light hydrocarbon values was higher than which calculated by using aromatic hydrocarbon parameters,suggesting the light hydrocarbon maturity mostly reflects the maturity of the late charged hydrocarbon.The 2M-/3M-C5 and 2M-/3M-C_(6) ratios varied in the ranges of 1.41‒1.81 and 0.79-1.09,respectively,and the iC_(5)/nC_(5) and 3M-C_(5)/nC_(6) ratios were 0.31‒0.90 and 0.16-0.37,respectively,indicating that ultra-deep Ordovician reservoirs have not experienced biodegradation.The Mango parameter K_(1) of the oil samples ranges 0.96‒1.01 except for the oil from Well SB4,which suggests that most of the reservoirs have not suffered thermochemical sulfur reduction(TSR).Meanwhile,the oils have not experienced evaporative fractionation since the toluene/nC_(7) and nC_(7)/MCC_(6) ratios range from 0.10-0.38 and 1.50‒1.80,respectively.The close correlation between P_(3) and P_(2)+N_(2) and between P_(2) and N_(2)/P_(3) indicates that the oils from different faults have the same origin.According to the characteristics of LHs rich in n-alkane,as well as other biomarkers,such as aryl isoprenoids,and aromatic hydrocarbon parameters,the oil originated from the source rock of Lower Cambrian Yu’ertusi Formation.Meanwhile,the source rocks in different fault zones slightly differed in organic facies.

关键词： light hydrocarbons biodegradation thermochemical sulfate reduction(TSR) evaporative fractionation ultra-deep Ordovician reservoir Tarim Basin

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Re-Examination of the Oil and Gas Origins in the Kekeya Gas Condensate Field,Northwest China——A Case Study of Hydrocarbon-Source Correlation Using Sophisticated Geochemical Methods

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 186-203页

作者： GONG Deyu WANG Zhaoyun LIU Gang CHEN Gang FANG Chenchen XIAO Zhongyao Research Institute of Petroleum Exploration and Development PetroChina Tarim Oilfield Company PetroChina

This work discussed the origins, alteration and accumulation processes of the oil and gas in the Kekeya gas condensate field based on molecular compositions, stable carbon isotopes, light hydrocarbons, diamondoid hydrocarbons and biomarker fingerprints. A comparison study is also made between the geochemical characteristics of the Kekeya hydrocarbons and typical marine and terrigenous hydrocarbons of the Tarim Basin. Natural gas from the Kekeya gas condensate field is derived from Middle–Lower Jurassic coal measures while the condensates are derived from Carboniferous–Permian marine source rocks with a higher maturity. In the study area, both natural gas and condensates have experienced severe water washing. A large amount of methane was dissolved into the water, resulting in a decrease in the dryness coefficient. Water washing also makes the carbon isotopic compositions of the natural gas more negative and partially reverse. Considering that the gas maturities are higher than once expected, gas generation intensity in the study area should be much stronger and the gas related to the Jurassic coal measures could promise a greater prospecting potential. As a result of evaporative fractionation, the Kekeya condensates are enriched in saturates and lack aromatics. evaporative fractionation disguises the original terrigenous characteristics of the light hydrocarbons associated with the natural gas, making it appear marinesourced. Thus, alteration processes should be fully taken into consideration when gas–source correlations are carried out based on light hydrocarbons. With the condensates discovered in the study area all being ＂migration phase＂, the pre-salt Cretaceous and Jurassic reservoirs may promise great exploration potential for the ＂residual phase＂ hydrocarbons. This research not only is of significance for oil and gas exploration in the southwest Tarim Basin, but also sheds light on the oil/gas-source correlations in general.

关键词： Kekeya gas condensate field evaporative fractionation water washing coal-derived gas marine condensates stable carbon isotopes diamondoid hydrocarbons

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