油气源岩综合定量评价指数及其应用  

COMPREHENSIVELY AND QUANTITATIVELY EVALUATING THE INDEX SRI OF OIL-GAS SOURCE ROCKS AND ITS APPLICATION

作　　者：庞雄奇[1] 陈章明[1] 陈发景[1] 

机构地区：[1]大庆石油学院,中国地质大学

出　　处：《天然气工业》1994年第6期6-11,共6页Natural Gas Industry

摘　　要：用生烃量评价源岩没有考虑排烃地质条件，用排烃量评价源岩得不出具有普遍对比意义的结论。采用的方法不同，得出的生、排烃量结果便不同。笔者基于排烃门限控油气理论，建立了烃源岩新概念，提出用相对排烃量指数（ＳＲＩ）定量评价烃源岩的方法。ＳＲＩ指标较之于其它指标，更能反映源岩的排烃特性和排量大小。ＳＲＩ小于０、等于０、大于０分别与非源岩、临界源岩和源岩相对应，数值大小反映源岩品质的好坏。源岩排甲烷气、重烃气和液态烃的相对大小分别用ＳＲＩｇｌ、ＳＲＩｇｎ和ＳＲＩｏ三指数表示，其数值及相对大小既反映源岩排油、气特性，又指明研究区油、气勘探前景。应用该方法，定量评价了海拉尔盆地源岩的生、排烃量，得出ＳＲＩｇｌ＞ＳＲＩｇｎ＞ＳＲＩｏ的结论，说明在该盆地应以天然气勘探为主。It is without considering expulsive hydrocarbon geological conditions to evaluate source rocks by hydrocarbon generating amount; It can not get the conclusion with general comparison significance to do that by expulsive hydrocarbon amount; If different methods are used, the different results of hydrocarbon generating amount and expulsive hydrocarbon amount are obtained. The new concept of hydrocarbon source rocks is set up on the basis of the heory of oil-gas controlled by expulsion threshold value of hydrocarbon. The method of quantitatively evaluating source rocks is proposed out by using the index(SRI) of relative expulsive hydrocarbon amount. SRI index can more reflect the characteristics and amount of expulsive hydrocarbon than other indexes. If SRI<0, it is not source rock; If SRI=0, it is critical source rock; If SRI>0, It is source rock. SRI value can reflect the characteristics of source rocks. The relative numerical values of expulsive methane, heavy hydrocarbon gas and liquid hydrocarbon of source rocks are respectively expressed by SRIgl,SRIgn and SRIo. The relative numerical values not only reflect the expulsive oil-gas characteristics of source rocks but also indicate the oil-gas exploration potential of research area. The hydrocarbon generating amount and expulsive hydrocarbon amount of the source rocks in Hailaer Basin are quantitatively evaluated and the conclusion of SRIgl,SRIgn and SRIo are obtained by the method, which indicates that the gas exploration should be the main task in the Basin.

关 键 词：生油层 气源岩 排烃量 评价 海拉尔盆地 综合定量评价指数 

分 类 号：P618.130.8[天文地球—矿床学] E122.3[天文地球—地质学]