Huangliu Fm
Type Locality and Naming
Hainan-offshore SW. The named section is located at No.6 Ying drill in the sea, 69 km southwest of Sanya, Hainan. Named in 1981 by Hu Pingzhong and Su Houxi, the Nanhai Petroleum Branch of China National Petroleum Corporation.
Lithology and Thickness
The Huangliu Formation is located between the Yinggehai Fm and the Meishan Fm, with a thickness between 280 and 638 m, with a maximum thickness of 1849 m (Hanoi Depression). It is completely or partially missing in the uplift area. The lithology is fine in the east, dominated by mudstone. To the west, there are interbeds of silty chalk, chalky siltstone, and chalky mudstone. In the western part of the basin, the Hanoi Depression is represented by sandstone, mudstone and interbedded coal. It is a large set of neritic gray mudstone with a depth of 1188 to 1532 m in No.6 Ying drill and contains limestone and sandy limestone in the lower part and dolomite and limestone in the middle part, with chalky strata in the upper part. The lower part of the lithology is gray lime mudstone with light gray sandy limestone containing foraminifera, clayey limestone, and sandy chalk; the middle part is gray mudstone, containing limestone, intercalated with micrite dolomite and sandy marl; the upper part is gray mudstone, containing chalk, intercalated with gray-white chalky micrite limestone and quartz siltstone, with a total thickness of 344m.
Relationships and Distribution
Lower contact
Disconformity contact with the underlying Meishan Fm.
Upper contact
Conformity contact with the overlying Yinggehai Fm.
Regional extent
This group is distributed in the Yinggehai Basin and the Qiongdongnan Basin.
GeoJSON
Fossils
The Huangliu Formation is rich in fossils such as foraminifera, ostracods, bivalves, gastropods, calcareous ultrafine fossils and pollen. Planktonic Foraminifera species include Globorotalia acostaensis, Globigerina nepenthes, Sphaeroidinellopsis seminulina, which is N16— In zone N17, benthos Foraminifera species are Uvigerina crassicostata, Ammonia aquatoriana, Pullenia bulloides, etc.; Ostracods are richer, and are the Argilloecia-Krithe-Xestoberis combination; rich in calcareous nannofossils, mainly Discoaster quinqueramus, Sphenolithusabies, Amaurolithus tricorniculatus, belonging to NN11 Belt; pollen is a combination of Quercoidites-Cupuliferoipollenites.
Age
Additional Information