天然气轻烃指标的地质意义——以鄂尔多斯盆地神木气田与塔西南坳陷山前带天然气藏为例

发布时间：2018-01-06 18:53

本文关键词：天然气轻烃指标的地质意义——以鄂尔多斯盆地神木气田与塔西南坳陷山前带天然气藏为例　出处：《石油与天然气地质》2017年05期 　论文类型：期刊论文

【摘要】：轻烃中蕴含有丰富的地球化学信息,具有重要的地质意义。依据一系列轻烃参数指标,对神木气田及塔西南坳陷山前带的天然气进行了系统分析。结果显示:神木气田及阿克莫木气田以煤成气为主,前者个别井可能有少量油型气的混入,而柯克亚-柯东气田则为混合成因气。首次提出链烷烃指数标准,当其大于2时,为油型气或混合气,小于2时,为煤成气。根据Mango参数K_1和K_2值,神木气田的天然气来自同一套烃源岩,而塔西南坳陷山前带天然气则来自不同的烃源岩。根据Mango参数交会图版综合判断,神木气田及阿克莫木气田的天然气主要来源于陆相高等植物,而柯克亚-柯东气田的天然气主要为混合成因。根据异庚烷及庚烷辨识标准,神木气田处于低成熟-成熟阶段,阿克莫木气田处于成熟阶段,而柯克亚-柯东气田则属于高成熟阶段。
[Abstract]:The light hydrocarbon contains abundant geochemical information and has important geological significance. It is based on a series of parameters of light hydrocarbon. A systematic analysis of natural gas in Shenmu gas field and the front belt of southwest Tarim depression is carried out. The results show that coal gas is the main gas in Shenmu gas field and Akimomo gas field, and a small amount of oil-type gas may be mixed in some wells in the former. For the first time, the standard of chain alkane index is put forward, when it is more than 2:00, it is oil type gas or mixture gas, less than 2:00. According to the values of Mango parameters Ks 1 and K _ 2, the natural gas of Shenmu gas field comes from the same set of hydrocarbon source rocks. On the other hand, the gas in the front belt of southwest Tarim depression comes from different hydrocarbon source rocks. According to the comprehensive judgement of Mango parameter intersection chart, the natural gas of Shenmu gas field and Akimomu gas field is mainly derived from higher terrestrial plants. According to the identification standard of isoheptane and heptane, Shenmu gas field is in low maturation stage, and Akmo gas field is in mature stage. Kekeya-Kedong gas field is a high mature stage.
【作者单位】：中国石油勘探开发研究院;北京大学地球与空间科学学院;
【基金】：国家科技重大专项(2016ZX05046-001)
【分类号】：P618.13
【正文快照】： 轻烃是油气中重要的组分之一,目前学者对此尚无统一定义。戴金星[1]认为,轻烃是指沸程在200℃以前的汽油烃,即碳数为5~10的烷烃化合物,包括天然气中伴生的部分凝析油和轻质油;郭瑞超[2]等将轻烃定义为C4-7的烷烃化合物;Mango[3]则认为轻烃为C1-9的烷烃化合物;Odden[4]则将轻烃

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