Origin of natural gas in Jurassic Da'anzhai Member in the western part of central Sichuan Basin, China
Origin of natural gas in Jurassic Da'anzhai Member in the western part of central Sichuan Basin, China
复制标题
川中西部侏罗系大安寨段天然气成因
DOI：
10.1016/j.petrol.2018.04.014
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发表时间：
2018-08
影响因子：
--
通讯作者：
Sh
中科院分区：
文献类型：
--
作者：
Kaiming Su;Jungang Lu;Guangwu Zhang;Sh
川中西部地区油气分布格局复杂，对天然气的来源存在诸多不同看法，制约了油田的进一步勘探和部署。为此，通过分析研究区天然气的地球化学特征和定量计算，结合构造、油气比等资料，对天然气的成因和来源进行了探讨和分析。结果表明，天然气的干燥系数在0.71 <$0.93之间，甲烷、乙烷和丙烷的δ 13 C值分别在−45.3 <$-38.0‰、−32.0 <$-25.6‰和−30.0 <$-25.3‰之间。同位素数据交会图和定量计算表明，大安寨段天然气以腐泥型和腐殖型天然气混合为特征，腐殖型天然气占20- 40%，最高可达70%。它是三叠系须家河组天然气向上运移的结果。异常高的气油比是这种向上侵入的重要表现。通过对高油气比威尔斯井的研究发现，从须家河组侵入并富集于大安寨段的腐殖型天然气分布不均匀。它继承了须家河组天然气“斑块式聚集”的特点。这种平面分布的不均匀性受断裂位置、断裂规模和下伏须家河组气藏规模的控制。大安寨段须家河组腐殖气在有利于须家河组天然气侵入、聚集和保存的区块中占有较大比例，而在不具备这些条件的区块中，天然气往往为伴生气。
The distribution pattern of oil and gas in the western part of central Sichuan Basin is complicated, there are many different views on the sources of natural gas, which restrict further exploration and deployment of oilfields. Therefore, by analyzing geochemical characteristics and quantitative calculation of natural gas in study area, combined with the data of structure and gas-oil ratio, the origin and sources of gas are discussed and analyzed. The results show that the dryness coefficient of the natural gas ranges between 0.71 ∼ 0.93, δ13C values range between −45.3 ∼ −38.0‰ in methane, −32.0 ∼ −25.6‰ in ethane and −30.0 ∼ −25.3‰ in propane. Crossplots of isotope data and quantitative calculation indicate that natural gas in Da'anzhai Member is characterized by the mixture of sapropelic and humic natural gas, the humic gas largely occupies the proportion of 20–40%, up to 70%. It is the result of upward migration of natural gas in Triassic Xujiahe Formation. The abnormally high gas-oil ratio is an important manifestation of this upward intrusion. Based on the study of high gas-oil ratio wells, the distribution of humic natural gas that intruded from Xujiahe Formation and enriched in Da'anzhai Member is unevenly distributed. It inherits characteristics of “Plaque accumulation” of natural gas in Xujiahe Formation. The inhomogeneity of this plane distribution is controlled by fault location, fault scale and the size of underlying Xujiahe Formation gas reservoirs. The humic gas from Xujiahe Formation occupies a large proportion in blocks of Da'anzhai Member which are favorable for intrusion, accumulation and preservation of Xujiahe Formation natural gas, whereas for blocks without these conditions, natural gas is often associated gas.
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影响因子：
3.9
作者：
G. Eglinton
通讯作者：
G. Eglinton
DOI：
10.1016/b978-0-12-812234-1.09001-4
发表时间：
2012-12
期刊：
--
影响因子：
--
作者：
C. Zou
通讯作者：
C. Zou
影响因子：
3.9
作者：
Cai, CF;Worden, RH;Yang, CC
通讯作者：
Yang, CC
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
Wu Xiao-qi;Hu Shipeng;Liao Fengrong;L. Zhensheng
通讯作者：
Wu Xiao-qi;Hu Shipeng;Liao Fengrong;L. Zhensheng
影响因子：
--
作者：
Hu Xiong
通讯作者：
Hu Xiong