烃源岩排烃系数的一元二次方程及其应用  

One Variable Quadratic Equation of Expulsion Coefficient from Source Rocks and Its Application

作　　者：陈义才[1] 李延钧[2] 廖前进[3] 孙晓明[3] 张胜[1] 王波[1] 李晓娟[1] 何逢阳[1] 

机构地区：[1]成都理工大学,成都610059 [2]西南石油大学,成都610500 [3]中国石油天然气股份有限公司大港油田油气勘探开发研究中心,天津300280

出　　处：《地质科技情报》2009年第3期86-90,共5页Geological Science and Technology Information

基　　金：国家自然科学青年基金项目(40602012)

摘　　要：排烃系数是成因法油气资源量评价的一个关键参数。根据烃源岩在生、排烃过程中单位体积内有机碳的质量平衡原理，以烃源岩的抽提、岩石热解仪分析数据为基础，通过6个独立代数方程推导出了关于排烃系数的一元二次方程。该方程中作为已知的参数是烃源岩的总残余有机碳（TOC）质量、残余可溶有机质（氯仿沥青“A”）的有机碳质量、干酪根热解烃有机碳质量（S2c）和有机质的原始降解率（D0）。通过黄骅坳陷板深68-1井沙-段排烃剖面上23个样品的实验分析数据，计算得出排烃系数在5％～41％之间。排烃系数计算结果的可靠性受烃源岩有机质的原始降解率的取值误差影响较大，在低成熟一成熟阶段，当混合型烃源岩有机质原始降解率的取值误差为10％时，排烃系数计算结果的相对误差一般为100～15％。The coefficient of hydrocarbon expulsion is a key parameter to petroleum resource evaluation by genetic method. According to the organic carbon mass balance principle during the process of the hydrocarbon generation and expulsion within unit volume of source rocks, one variable quadratic equation of expulsion coefficient was derived through six separate algebraic equations based on the data of source rock extrusion and rock-eval. The equation parameters are known as the residual organic carbon in hydrocarbon source rocks（TOC）, soluble organic matter （chloroform bitumen ＂A＂）, kerogen pyrolysis hydrocarbons （S2） as well as the original organic matter degradation rate. According to the experimental data of 23 source rock samples from hydrocarbon expulsion profiles of Banshen 68-1 well Shal Member in Huanghua Depression, the expulsion coefficient is about 5%--41% through the equation calculation. The reliability of the calculated results is mainly influenced by the error of original the degradation rate. In low mature and mature stage, when the relative error of original degradation value is lower than 10M in mixed hydrocarbon source rocks, the relative error of expulsion coefficient is usually 10%--15 %.

关 键 词：排烃系数 烃源岩 质量平衡 岩石热解 有机碳 

分 类 号：TE132.1[石油与天然气工程—油气勘探]