柴达木盆地花土沟地区地层剥蚀厚度恢复及其地质意义  

RESTORATION OF STRATA EROSION THICKNESS AND ITS GEOLOGICAL SIGNIFICANCES IN HUATUGOU AREA OF QAIDAM BASIN

作　　者：陈晓智[1,2] 许浩[1,2] 汤达祯[1,2] 胡晓兰[1,2] 尹微[3] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]中国地质大学海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]中国石油勘探开发研究院,北京100083

出　　处：《大庆石油地质与开发》2011年第1期16-20,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金青年项目（40802027）和中国石油股份公司风险创新基金项目（0706d01040102）资助.

摘　　要：地层的抬升与剥蚀是沉积盆地中普遍存在的地质现象，剥蚀量的大小对油气生成、运移和聚集会产生不同的影响。恢复地层的剥蚀厚度是研究沉积盆地构造演化史和油气成藏史的重要基础工作。为此，采用声波时差法和优化孔隙度法恢复了地层剥蚀厚度，在此基础上探讨了研究区烃源岩埋藏史及生烃演化史，同时阐述了地层剥蚀与该区异常低压之间的关系。研究结果表明：两种方法计算结果比较接近，上新统地层剥蚀厚度约为1600m；地层的构造抬升剥蚀期对应着烃源岩的主力生排烃期；异常低压的形成主要是地层构造抬升剥蚀作用的结果。Strata uplift and denudations are the common phenomena in sedimentary basin, the amount of the denudation possesses different influences on petroleum generation, migration and enrichment. The recover strata erosion thickness is important basic work for the studies of the structural evolution and hydrocarbon formation history of a sedimentary basin. Therefore, with the help of the methods of interval transit-time and optimized porosity, the above recovery is conducted. On the basis of the above achievements, the buried history of source rock and hydro- carbon generation and evolution process are studied. At the same time, the relationship between strata denudation and the abnormal pressure in this region is described. The study results indicate that the calculation results of the two methods are similar; the erosion thickness of Pliocene is about 1 600 m. The time of tectonic uplift-erosion of the strata corresponds to the major hydrocarbon generation-expulsion periods of the source rock. The formation of abnormal pressure mainly results from tectonic uplift-erosion of the strata.

关 键 词：剥蚀厚度 构造抬升 地质意义 花土沟地区 柴达木盆地 

分 类 号：P618.13[天文地球—矿床学]