摘要
系统地讨论了中扬子区海相地层中油气显示的类型、横向和纵向分布规律及产状,并探讨了其石油地质意义。重点解剖了澧县凹陷和沉湖-土地堂宽向斜区的油气显示,证明这两个地区作为远景区是可行的。研究中利用了显微油气显示方法(有机包裹体、岩石吸附烃),并取得了一些成果。
Of all the oil and gas shows in the marine strata in Central Yangtze Region,bitumenis most common,then oil shows,and the gas shows are the last.Since hydrocarbon evo-lution degrees are different,bitumen is mostly in Lower Paleozoic,gas shows mainly inthe Silurian and Devonian,and oil slows in the Permian and Triassic.This indicates thatgas exploring should aim at the Paleozoic and oil at Mesozoic.The oil and gas shows areconcentrated in the two limbs of Huangling anticline,the north margin of South JiangnanUplift and the two limbs of Chenhu-Tuditang syncline.It is obvious that the loss of oiland gas are bound up with strong uplift and denudation.Tensile and tensile-shear faults are the principal factor in controlling oil and gas shows,and the migration path and accu-mulation space as well as the chief factor of hydrocarbon lossing.Most of the oil and gasshowings are in fracture,fracture-miarolitic cavity and fracture cave.The study of oil-gas shows indicates that,Lixian Sag is one of the best areas in hydrocarbon potential inthe Central Yangtze Region.The fault draps covering the footwall of the faults arefavourable storages.The limbs of Chenhu-Tuditang syncline are the localities for themigration,accumulation and escape of hydrocarbon,and the place of the unity of oppo-sites is important for seeking oil and gas.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1992年第2期155-166,共12页
Oil & Gas Geology
基金
"七五"重点科技攻关项目<鄂中地区中新生代构造演化与海相油气关系>的部分内容.
