Light hydrocarbon geochemical characteristics and their application in Upper Paleozoic, Shenmu gas field, Ordos Basin
Light hydrocarbon geochemical characteristics and their application in Upper Paleozoic, Shenmu gas field, Ordos Basin
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DOI：
10.1177/0144598716679962
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发表时间：
2017-01
影响因子：
2.7
通讯作者：
Wenxue Han;S. Tao;G. Hu;Weijiao Ma;Dan Liu;Ziqi Feng;W. Peng
中科院分区：
文献类型：
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作者：
Wenxue Han;S. Tao;G. Hu;Weijiao Ma;Dan Liu;Ziqi Feng;W. Peng
神木气田轻烃具有丰富的地球化学信息，但对其研究较少。以神木气田上古生界为例，利用气相色谱技术对轻烃进行了系统研究。结果表明：（1）神木气田以煤成气为主，但实验数据表明，煤成气中混入了部分油成气。(2)根据K1、K2参数和Halpern星星图，神木气田上古生界天然气属于同一含油气系统，气源岩的沉积环境应具有同源性。(3)烃源岩主要来源于陆生高等植物，根据甲基环己烷指数和Mango参数交会图，排除了上古生界灰岩为烃源岩的可能性，属于沼泽相腐殖型烃源岩。(4)异庚烷的范围为1.45 - 2.69，平均值为2.32，正庚烷的范围为9.48 - 17.68%，平均值为11.71%，低于20%。神木气田上古生界天然气成熟度为低成熟度-正常成熟度阶段，与Ro资料一致。(5)神木气田上古生界天然气未经历长期运移和二次变化，可以用轻烃指标进行准确分析。
Light hydrocarbon has abundant geochemical information, but there are few studies on it in Shenmu gas field. Taking Upper Paleozoic in Shenmu gas field as an example, authors use gas chromatography technology to study light hydrocarbon systematically. The results show that (1) The Shenmu gas field is mainly coal-derived gas, which is mixed by partial oil-derived gas due to the experiment data. (2) Based on K1, K2 parameter and Halpern star chart, the Upper Paleozoic gas in Shenmu gas field belongs to the same petroleum system and the depositional environment of natural gas source rocks should be homologous. (3) The source rocks are mainly from terrestrial higher plant origins and belong to swamp facies humic due to methyl cyclohexane index and Mango parameter intersection chart, which excluded the possibility of the Upper Paleozoic limestone as source rocks. (4) The isoheptane ranges from 1.45 to 2.69 with an average of 2.32, and n-heptane ranges from 9.48 to 17.68% with an average of 11.71%, which is below 20%. The maturity of Upper Paleozoic gas in Shenmu gas field is low-normal stage, which is consistent with Ro data. (5) The Upper Paleozoic natural gas in the Shenmu gas field did not experience prolonged migration or secondary changes, thus can be analyzed by light hydrocarbon index precisely.