长岭断陷东岭鼻状构造带沙河子组烃源岩特征及评价  

Characteristics of hydrocarbon source rocks in Shahezi Formation in Dongling nose structural belt,Changling fault depression and its evaluation

作　　者：刘曼丽[1] 高福红[2] 徐文[1] 

机构地区：[1]中石化东北油气分公司勘探开发研究院,长春130062 [2]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2016年第1期184-190,共7页World Geology

基　　金：中石化东北石油局项目"长岭凹陷深部储层成岩作用及微观物性分析"(3450003-12-ZC0607-005)

摘　　要：为确定东岭鼻状构造带沙河子组烃源岩的发育程度,本文应用有机地球化学分析方法,对沙河子组的暗色泥岩进行了有机质丰度、类型和成熟度的研究。研究结果显示:有机碳平均含量为2.21%,生烃潜量平均值为9.13 mg/g,氯仿沥青"A"含量>0.5%,总烃含量>500×10^(-6),说明沙河子组暗色泥岩有机质丰度较高;有机显微组分中惰质组分含量较低,"壳质组+腐泥组"相对含量远远高于镜质组和惰质组。T_(max)为446℃~462℃,结合T_(max)与氢指数和降解指数的关系,指示有机质干酪根类型以II1~I型为主;镜质体反射率(Ro)为0.56%~0.71%,处于低成熟-成熟阶段。综合分析认为沙河子组烃源岩有机质丰度高,有机质类型好,有机质成熟度处于低成熟-成熟阶段,属于中等-好的烃源岩,以生油为主。东岭断鼻构造带沙河子组具有较大的勘探潜力。In order to confirm the developing level of hydrocarbon source rocks of Shahezi Formation in Dongling nose belt,we have researched the abundance,type and maturity of organic matter yielded in the dark mudstone in the Shahezi Formation by organic geochemistry. The results show that the average content of ＂TOC＂is 2. 21%,the average potential hydrocarbon generation amount is 9. 13 mg / g,the content of chloroform bitumen＂A＂is more than 0. 5% and the total hydrocarbon content is greater than 500 × 10^（-6）. Above parameters suggest the dark mudstone in the Shahezi Formation has high abundance of organic matter. The content of inertinite is low and the content of exinite and sapropelinite is higher than that of vitrinite and inertinite. T_（maxis） 446℃ ~ 462℃.Combined with the relationship of T_（max） with hydrogen exponent and degradation index,it is indicated that the major kerogen belongs to type II_1~ I. The vitrinite reflectance（ Ro） is 0. 56% ~ 0. 71% which indicates the low mature to mature stage. In summary,we conclude that the hydrocarbon source rocks of Shahezi Formation are characterized by high content of organic matters and it is of better organic matter in type. The organic matter maturity is almost in the stage from low mature to mature,which is medium-good in hydrocarbon source rocks for oil-forming. The Shahezi Formation in Dongling nose belt has a great potential for exploration.

关 键 词：长岭断陷 烃源岩 有机质 有机质类型 成熟度 

分 类 号：P618.130[天文地球—矿床学]