谭庄-沈丘凹陷二叠系烃源岩热史模拟——以周16井为例  

Thermal History Modeling of Permian Source Rocks in Tanzhuang-Shenqiu Sag

作　　者：林小云[1] 刘俊[1] 陈倩岚[1] 高慧娉[1] 蒋伟[1] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学)长江大学地球科学学院,湖北荆州434023

出　　处：《石油天然气学报》2010年第2期16-20,共5页Journal of Oil and Gas Technology

基　　金："全国油气资源战略选区调查与评价"专项课题(XQO-2007-02-3-3)

摘　　要：谭庄-沈丘凹陷位于周口坳陷中部凹陷带,周16井位于凹陷西部构造高部位。以镜质体反射率Ro为古温标的热史恢复结果表明,谭庄-沈丘凹陷古生代为克拉通台地阶段基底,热流值较低;印支-燕山期构造活动强烈,基底热流值升高,早白垩世末达到最高古热流;从晚白垩世开始热流值降低,盆地冷却。加里东、印支、燕山、喜山4大构造运动造成的不整合面上地层剥蚀量分别为300、1090、1080、600m,不整合面对应地史时期基底古热流值分别为48、68、74、50mW/m2。周16井二叠系烃源岩238Ma进入成熟早期阶段,早中三叠世进入初次生烃期,后期地层多次抬升与沉降,早白垩世中晚期出现二次生烃,有利于晚期成藏。Tanzhuang-Shenqiu Sag was located in the central Zhoukou Depression zone,Well Zhou 16 was in the structural high part of western depression.By taking Ro as palaeo-temperature scale,the results of thermal history restoration show that the basal heat flow of Tanzhuang-Shenqiu sag was relatively low at the stage of cratonic platform in Paleozoic.The basal heat flow was elevated with intensive tectonic activities from Indo-Chinese epoch to Yanshanian epoch,which reached maximum values at the end of early Cretaceous.The heat flow decreased and the basin was cooled since the late Cretaceous.The stratigraphic erosion amount of the unconformity surface in Caledonian movement,Indo-China movement,Yanshanian movement and Himalayan movement were 300,1090,1080,600 m respectively,the basal heat flows of each unconformity surface were 48,68,74,50 mW/m2 respectively in corresponding geologic history epoch.The Permian source rocks of Well Zhou 16 entered into early mature stage in 238 Ma,it came into the stage of primary hydrocarbon generation in early-middle Triassic.At the late stage it experiences several stratigraphical uplifting and subsidencing times,the source rocks have secondary hydrocarbon generation in middle late early Cretaceous,it is beneficial to the late hydrocarbon accumulation.

关 键 词：谭庄-沈丘凹陷 烃源岩 热史 成烃史 二次生烃 

分 类 号：P618.13[天文地球—矿床学]