英台断陷深层的气源条件及勘探潜力  

Gas Source Conditions and Exploration Potential of Deep Layer in Yingtai Fault Depression

作　　者：卢双舫[1] 胡慧婷[1] 刘海英[1] 邵明礼[2] 王立武[2] 张世广[1] 黄文彪[1] 仲维维[1] 吴高平[1] 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318 [2]吉林油田有限责任公司勘探开发研究院,吉林松原138000

出　　处：《吉林大学学报（地球科学版）》2010年第4期912-920,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家'973'计划项目(2009CB219306);教育部新世纪优秀人才支持计划项目(NCET-04-0345)

摘　　要：为了评价和认识天然气勘探已获重大突破的松辽盆地深层中部断陷带之外断陷的勘探潜力,利用龙深1井风险探井的分析资料,从定性评价和定量计算的结合上,对英台断陷的气源条件和勘探潜力进行了系统研究。结果表明:英台断陷深层营城组、沙河子组不仅暗色泥岩较为发育、残余有机质丰度较高、有机质普遍处于有利于大量成气的高—过成熟阶段,而且有机质类型并不像前人认为的那样以III型有机质为主,而是以绝对成气潜力更高的Ⅱ1、Ⅱ2型为主,这进一步提高了深层断陷的成气潜力;恢复之后的有机质原始丰度和原始生烃潜力更高,体现了恢复对客观评价高—过成熟源岩的重要意义;初步的定量评价表明,英台断陷的天然气资源量为(938～3758)×108m3,具有形成大中型气田(群)的气源条件。这也可能意味着松辽盆地除了中部的徐家围子和长岭断陷之外,其它断陷也具备值得重视、探索的勘探潜力。In order to evaluate and recognize the exploration potential of fault depressions except for the middle part fault depression where had a great breakthrough, the geological and geochemical data from the risk exploration well-Longshen 1, qualitative appraisement and quantitative calculation method are used to study gas source conditions and the exploration potential of Yingtai fault depression. This research indicates that dark mudstones of K1yc and K1sh layers are relatively development and the residual organic carbon content is relatively higher, and the organic matter is mainly at high-to over-mature evolution stage, especially with type Ⅱ1 and Ⅱ2 organic matter which have a higher gas generation potential, other than the type III organic matter accepted by predecessor. All above evidence hints there is a better exploration potential in deep fault depression. Meanwhile, the original carbon content and hydrocarbon potential of organic matter are much higher than present values, which indicate the signification of restitution for the objective appraisement of high-over-mature source rock. Quantitative appraisement preliminarily reveals that the gas resource of Yingtai fault depression is ranger from 93.8 to 375.8 billion cubic meters, where has a gas source condition for forming medium to large-sized gas fields or groups. It also means that some fault depressions have important and exploratory exploration potential, besides Xujiaweizi and Changling fault depression.

关 键 词：英台断陷 气源条件 勘探潜力 有机碳原始丰度 原始生烃潜力 

分 类 号：P618.13[天文地球—矿床学]