Composition and Genetic Analysis of Natural Gas in Mandong Area, Tarim Basin
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摘要: 满东地区天然气气井位于满东构造带、龙口构造带、英南构造带和英东构造带,具有广阔的天然气勘探前景。笔者就满东地区满东1井、龙口1井、英南2井、英东2井4口井天然气组分组成、碳同位素组成等特征综合分析该区天然气的成因类型。研究认为,满东1、龙口1、英南2井天然气为典型的湿气,CO2含量低,N2含量很高,为原油裂解气;英东2井天然气为干气,CO2含量相对前3口井较高,N2含量较低,为干酪跟裂解气;CO2、N2均为有机成因。满东地区天然气均属于高-过成熟海相腐泥型天然气。通过研究,希望对满东地区天然气地球化学的基础理论研究及塔里木盆地台盆区天然气的勘探工作提供借鉴和依据。Abstract: Natural gas wells of Mandong area are located in Mandong, Longkou, Yingnan and Yingdong tectonic belts, having broad prospects for gas exploration. In this paper, the gas components carbon isotopic composition of the natural gas from Well Mandong 1, Well Longkou 1, Well Yingnan 2 and Well Yingdong 2 have been analyzed to discuss the genetic type of natural gas in this area. The results indicate that the natural gas from Well Mandong 1, Well Longkou 1 and Well Yingnan 2 has a few CO2 and lot N2, which is kerogen-cracking gas and typical wet gas. The natural gas from Well Yingdong 2 has a lot CO2 more than other three wells, and has a few N2, which is oil-cracking gas and belongs to a typical dry gas. The CO2 and N2 are organic origin. Natural gas of Mandong area is high and over matured marine sapropelic type gas. These findings will further guide the work of natural gas exploration in Tarim Basin.
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Key words:
- Mandong /
- natural gas composition /
- oil-cracking gas /
- kerogen-cracking gas
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