断陷盆地缓坡带物源转换与沉积响应

doi:10.11743/ogg20230313

Abstract

Abstract:

The quantified coupled response of intra-basin sedimentary system to extra-basin sediment flux variation is still a weak link in source-to-sink system research， and also an important topic in the framework of source-to-sink system research in downfaulted basins. Based on the 3D seismic and log data， as well as core observation of the Lixian slope in the Raoyang Sag， combined with detrital zircon U-Pb dating， the study carries out quantitative characterization of the provenance system during the deposition of the second and first members of the Paleogene Shahejie Formation （that is， Sha 2 and Sha 1 members）， and establishes a quantitative characterization method for shallow-water delta by means of quantitative sedimentary structure interpretation and quantitative seismic geomorphic measurements. The results show that the sediment flux of the paleo-Yongding River branch was seized by the paleo-Daqing River， resulting in the sediment flux decrease from 37 % to 26 % in zone A of Lixian slope during the sedimentation of Sha 1 to Sha 2 members， the corresponding area of the delta in zone A declining from 144 km² to 38 km² and a reduction of the average subaqueous distributary channel width from 104 m to 47 m. While the sediment flux of the paleo-Tang River increased from 31 % to 39 %， corresponding to an increase in the area of delta in zone B from 71 km² to 94 km² and an increase in the average subaqueous distributary channel width from 77 m to 88 m. No significant changes are observed in the sediment flux of the paleo-Dasha River， and the corresponding area of the delta in zone C decreased from 206 km² to 185 km²， and the average subaqueous distributary channel width decreased from 120 m to 81 m. Allogenetic forces such as tectonic evolution， climate change， and lake-level fluctuation tend to generate larger scope of influence， causing the synchronous response of sedimentary systems. In contrast， changes in sediment flux will affect specific sedimentary systems and are the primary driving mechanism for the sedimentary response of shallow-water deltas in the study area.

Key words: seismic geomorphology, sedimentary structure, detrital zircon dating, source-to-sink system, shallow-water delta, Lixian slope, Raoyang Sag, Bohai Bay Basin

CLC Number:

TE121.3

Hehe CHEN, Xiaomin ZHU, Ruisheng SHI, Zili ZHANG, Qi LI, Zhenjun ZHU, Zehao YAN. Provenance transformation and sedimentary response of ramp facies in downfaulted basins： A case study on the Paleogene source-to-sink system in Lixian slope， Raoyang Sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2023, 44(3): 689-706.

Figures/Tables 12

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层位	区域	交错层理平均厚度/cm	沙丘平均高度/cm	水深/m	平均河道深度/m	平均河道宽度/m	河道带宽度/m
沙一段	A区三角洲	15	44	3.5 ~ 4.5	2.5	47	310 ~ 670
	B区三角洲	21	62	5.0 ~ 6.0	3.5	88	570 ~ 1 070
	C区三角洲	20	59	5.0 ~ 6.0	3.4	81	530 ~ 1 010
沙二段	A区三角洲	23	68	5.5 ~ 7.0	3.9	104	680 ~ 1 220
	B区三角洲	20	57	5.0 ~ 6.0	3.3	77	500 ~ 970
	C区三角洲	25	73	6.0 ~ 7.0	4.2	120	780 ~ 1 360

层位	不同流域特征锆石地质年龄（占比/%）
层位	古大清河（A区）	古唐河（B区）	古大沙河（C区）
沙一段	Pz （26）	Mz（16）	Pt₁（35）
		Pt₂₊₃（15）
		Ar₂₊₃（8）
沙二段	Pz （37）	Mz（13）	Pt₁（32）
		Pt₂₊₃（8）
		Ar₂₊₃（10）

层位	物源体系	特征锆石含量/%	三角洲	水深/m	平均河道深度/m	平均河道宽度/m	河道带宽度/m	三角洲面积/km²
沙一段	古大清河	26	A	3.5 ~ 4.5	2.5	47	312 ~ 674	38
	古唐河	39	B	5.0 ~ 6.0	3.5	88	578 ~ 1 079	94
	古大沙河	35	C	5.0 ~ 6.0	3.4	81	529 ~ 1 009	185
沙二段	古大清河	37	A	5.5 ~ 7.0	3.9	104	681 ~ 1 222	144
	古唐河	31	B	5.0 ~ 6.0	3.3	77	506 ~ 975	71
	古大沙河	32	C	6.0 ~ 7.0	4.2	120	785 ~ 1 362	206

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Provenance transformation and sedimentary response of ramp facies in downfaulted basins： A case study on the Paleogene source-to-sink system in Lixian slope， Raoyang Sag， Bohai Bay Basin

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