松辽盆地布海—合隆地区天然气烃源岩特征及资源量计算

Characteristics of Hydrocarbon Source Rocks and Quantitative Calculation of Natural Gas Resources in Buhai——Helong Region of Songliao Basin

布海—合隆地区是松辽盆地东南隆起区重要的天然气资源产地之一,天然气资源尚处于勘探中期。从烃源岩的有机质类型、丰度、演化特征、烃源岩分布和生烃潜力评价等五个方面说明该区的烃源岩特征,认为沙河子组—营城组的烃源岩具有较好的生烃能力,而登娄库组的生烃能力一般。热解规律显示,当埋深超过2600m左右,开始大量生气,并且高成熟阶段以湿气为主,而过成熟阶段以干气为主。在分析烃源岩特征的基础上,结合氯仿沥青"A"、有机炭、降解率、排烃系数、聚集系数、暗色泥岩有效面积和厚度等参数,应用残烃和热模拟两种方法分别计算了布海—合隆地区登娄库组和沙河子组—营城组的天然气资源量。

Buhai--Helong region is one of the important regions producing natural gas in the southeast apophysis of Songliao Basin. Gas resources are in their metaphase. Based on the organic matter types, abundance, evolution characteristic, distribution and generation potential of the hydrocarbon source rocks, the aurhors consider that the hydrocarbon source rocks from Shahezi Formation--Yingcheng Formation have better ability for producing hydrocarbon, and Denglouku Formation has average ability. When the hydrocarbon source rock is buried more than a(c)2 600 m in depth under the Earth's surface, it begins to produce a great deal of wet gas in the phase of high maturation, while in the phase of over--maturation, it mainly produces a great deal of dry gas. Based on analyzing characteristics of the hydrocarbon source rocks and with the extract 'A',organic carbon, degradation ratio, hydrocarbon accumulation coefficient, effective area and thickness of mudstone, the authors calculate the quantity of the natural gas resources in the Shahezi Formation--Yingcheng Formation and Denglouku Formation with the methods of hydrocarbon retention and simulation.