摘要
莺东构造带位于莺歌海盆地的东北部，面积约２×１０４ｋｍ２，现已在该构造带发现背斜、断块、岩性、基底潜山、礁等一批圈闭。莺歌海盆地存在三套烃源岩：即崖城组—陵水组滨海沼泽煤系地层和浅海相泥岩、梅山组浅海—半深海相泥岩、莺歌海组浅海—半深海相泥岩。莺东构造带自下而上有５套生储盖组合，组合类型有自生自储、下生上储、上生下储三种。Ｔ６０、Ｔ４０两个区域不整合界面是莺东构造带油气运移的主要通道；工区内岩性圈闭主要集中分布在梅山组～莺歌海组组成的“黄金组合”中，是近期内最有希望发现大气田的领域。工区内可划分为两个不同的天然气系统：下第三系天然气系统和上第三系天然气系统，后者在近期内有较好的勘探前景。ＬＴ１—１、ＣＪ３１—２、ＬＤ１１—１、ＬＴ８—１、ＬＴ３３—１等是目前最为有利的含气圈闭。
Yingdong structure belt is located in the northeast of Yinggehai Basin,being of an area of 2×10 4km 2,and a lot of traps as the anticlinal,fault and lithologic ones as well as the buried hill and bioherm,etc.,have been found in the structure belt.There are three suits of source rocks in Yinggehai Basin,i.e.Yacheng Formation Lingshui Formation's littoral paludal coal measure strata and neritic mudstone,Meishan Formation's neritic bathyal mudstone and Yinggehai Formation's neritic bathyal mudstone.There are five sets of source reservoir seal assemblages from bottom to top in Yingdong structural belt,the types of the assemblages being the self generating and self storing,bottom generating and top storing as well as top generating and bottom storing ones.The two regional unconformities (T 60 and T 40 ) are the main hydrocarbon migration passages in Yingdong structural belt.The lithological traps in the working region are mainly concentrated in the “Golden Assemblage” formed from the Meishan Formation to Yinggehai Formation,being the area of most hopefully finding giant gas fields in the near future.Two different gas systems may be divided in the working region,i.e.the Paleogene system and Neogene system;the latter has quite good exploration prospects in the near future.The LT1—1,CJ31—2,LT8—1,LT33—1 and LD11—1 are the most favourable gas bearing traps forecased at present.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1999年第1期31-34,共4页
Natural Gas Industry
