琼东南盆地南部隆起带渐新统崖城组层序沉积模式. (Chinese)

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Tytuł:: 琼东南盆地南部隆起带渐新统崖城组层序沉积模式. (Chinese)
Autorzy:: 傅恒
 匡明志
 何小胡
 王文博
 廖启丰
 李兴旺
Temat:: NATURAL gas prospecting
SEQUENCE stratigraphy
RESERVOIRS
FACIES
LEGAL education
PROVENANCE (Geology)
SEDIMENTARY facies (Geology)
Alternatywny tytuł:: Sequence sedimentary models of Oligocene Yacheng Formation in the southern uplift belt of the Qiongdongnan Basin. (English)
Źródło:: Natural Gas Industry; 2020, Vol. 40 Issue 12, p18-28, 11p
Abstract (English):: In the southern uplift belt of the Qiongdongnan Basin, major breakthroughs in natural gas exploration have been continuously made in the pre-Paleogene buried hill bedrock reservoirs and Oligocene Yacheng Formation sandstone reservoirs in recent years. Therefore, the sequence stratigraphy, sedimentary provenance and sedimentary facies distribution under the sequence framework of the Yacheng Formation in the southern uplift belt are studied based on the latest drilling and seismic data. The study results were achieved as follows. (1) There are three third-order sequences in the Yacheng Formation of the southern uplift belt. Each third-order sequence is controlled by the third-order sea-level change, forming a periodical transgressive system tract and a highstand system tract. The lowstand system tract mainly transforms the highstand system tract of the old sequences. (2) The Yacheng Formation has the characteristics of multiple depocenters and multiple provenances. In each sag, fan delta-continental shelf deposits with wide facies belt are developed on the gentle slope, and subsea fan-continental shelf deposits with narrow facies belt are developed on the steep slope. (3) There are three sequence depositional models in the Yacheng Formation of the southern uplift belt: transgressive system tract, highstand system tract and lowstand system tract. (4) The basement of pre-Paleogene buried hill granite in the southern uplift belt suffered long-term exposure and denudation, and the ancient uplift formed important buried-hill granite reservoir. The Yacheng Formation remains a larger area of fan delta sand bodies that were denuded and reformed during the low stand stage, forming sandstone reservoirs with a certain scale. It is concluded that the research results can provide basis for studying the distribution law of clastic reservoirs in the Yacheng Formation in this area. [ABSTRACT FROM AUTHOR]
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