Sedimentary provenance of the first member of the Shahejie Formation,Lixian Slope,Raoyang Sag

doi:10.13745/j.esf.sf.2020.5.12

Abstract

Abstract:

Source supply not only affected the distribution characteristics of the 1^st Member of Shahejie Formation, Lixian Slope, Raoyang Sag, Jizhong Depression, but also controlled the sedimentary type and facies distribution, which in turn controlled the development of favorable hydrocarbon reservoirs. In order to clarify the sedimentary provenance of the Lixian Slope to support further research on the sedimentary system and oilfield exploration, we carried out a comprehensive analysis of sedimentary provenance based on 3D seismic data, petrological characteristics, heavy mineral compositions as well as the ZTR index, detrital zircon geochronology and morphology of the Paleogene Shahejie Formation. The results are summarized below. (1) Progradational seismic reflections were mapped downlapping in the northern, western and southwestern parts of the slope, and the composition maturity and ZTR indices of clastic rocks increased toward southeast, east and northeast, respectively, indicating water systems carrying material sources were injected, into the northern, western and southwestern parts of the slope, respectively. (2) According to the component characteristics of lithics and heavy minerals, the Lixian Slope can be divided into three regions A, B and C. Strata in region A resemble basement uplift or dissected arc in terms of component characteristics, and contain recycled orogenic elements; the components of lithic and heavy mineral assemblages are igneous and sedimentary rocks and garnet-zircon-magnetite-hematite, respectively. In regions B and C, strata resemble basement uplift. In region B, lithification resulted in magmatic and sedimentary rocks with small amount of metamorphic rock, and heavy minerals are garnet and zircon. Region C featured igneous/sedimentary/metamorphic rock combination in lithic rock fragments, and heavy minerals are garnet, zircon and ilmenite. Sedimentary deposition on the slope was controlled by the water systems injected from the north, west, and southwest and converging in the Xiliu area. (3) The morphology and geochronology of detrital zircons showed that the Taihangshang uplift was the parent rock area corresponding to each provenance in the survey area. The rivers carrying the northern, western and sourthwestern provenances mainly flew through the Wutai-Xinzhou-Laiyuan, Fanshi-Laiyuan-Fuping and Wutai-Fuping-Dingzhou areas, respectively, and the parent rocks they carried were mainly Proterozoic and Paleozoic, Paleozoic and Proterozoic and Paleozoic magmatic rocks, respectively. Compared with the 2^nd Member of the Shahejie Formation, the capacity of the western provenance in the 1^st Member was significantly enhanced while that of the southwestern provenance relatively decreased. (4) The shallow-water delta deposition systems formed after the water system injection, with the tendency of stronger provenance supply thus better sand-body development closer to the source.

Key words: provenance analysis, rock characteristic, zircon U-Pb dating, 1^st Member of Shahejie Formation, Lixian slope, Raoyang Sag

CLC Number:

DU Yifan, ZHU Xiaomin, GAO Yuan, LI Linglong, YE Lei, LI Xiaodong, LIU Qianghu, LI Chenghai, ZHAO Tiedong, CHEN Yaqing. Sedimentary provenance of the first member of the Shahejie Formation,Lixian Slope,Raoyang Sag[J]. Earth Science Frontiers, 2021, 28(1): 115-130.

Figures/Tables 16

Fig.1 Structural map of the Lixian Slope and generalized stratigraphic column of the Paleogene Shahejie Formation, Raoyang Sag

Fig.2 Stratigraphic section of the Baoding Sag-Gaoyang Uplift-Raoyang Sag (Section location see Fig.1a). Adapted from [17].

Fig.3 Paleo geomorphology of the Lixian Slope, Raoyang Sag (See Fig.4 for seismic line profile AA'-CC')

Fig.4 Progradational reflection characteristics of the Lixian Slope, Raoyang Sag (Profile location see Fig.3)

Fig.5 Triangle diagram of clastic components of the 1st Member of the Shahejie Formation, Lixian Slope

Fig.6 Clastic components and lithic assemblages of the 1st Member of the Shahejie Formation, Lixian Slope

Fig.7 Heavy mineral assemblages and the planar variation of the ZTR index in the 1st Member of the Shahejie Formation, Lixian Slope

Fig.8 Zircon cathode luminescence plate of the 1st Member of the Shahejie Formation in Well G59 of the Lixian Slope, Raoyang Sag

Fig.9 Thorium/U ratio in detrital zircon from the Shahejie Formation, Lixian Slope, Raoyang Sag

Fig.10 Detrital zircon U-Pb age harmonic curves and spectrograms of four wells in the 1st Member of

Table 1 The U-Pb age composition of detrital zircons from the Shahejie Formation, Lixian Slope, Raoyang Sag

井	层位	550~150 Ma		1 960~1 770 Ma		2 630~2 300 Ma
井	层位	频数	频率/%	频数	频率/%	频数	频率/%
G22	Es₁	33	66.0	5	10.0	12	24.0
G59	Es₁	36	53.7	17	25.4	10	14.9
N202	Es₁	28	38.9	17	23.6	23	31.9
XL101	Es₁	35	47.3	19	25.7	16	21.6
XL8	Es₁	37	60.7	8	13.1	14	23.0
Y66	Es₂	25	35.7	18	25.7	22	31.4
R4	Es₂	19	31.7	14	23.3	22	36.7
XL8	Es₂	28	39.4	20	28.2	20	28.2

Fig.11 Distribution of Paleogene bedrocks and provenance direction in the Lixian Slope, Raoyang Sag. Adapted from [11]. the Shahejie Formation, Lixian Slope, Raoyang Sag

Table 2 The age composition of the parent rock in the Shahejie Formation, Lixian Slope, Raoyang Sag

物源体系	井号	层位	物源比例
物源体系	井号	层位	太古宇母岩	元古宇母岩	古生界母岩	中生界母岩
北部	G59	Es₁	7.4%	34.3%	38.9%	19.4%
北部	Y66	Es₂	14.3%	50.0%	25.7%	10.0%
西部	G22	Es₁	12.0%	22.0%	48.0%	18.0%
西部	G30	Es₂	8.0%	46.0%	35.0%	11.0%
南西部	N202	Es₁	15.3%	44.4%	37.5%	2.8%
南西部	R4	Es₂	15.0%	53.3%	28.3%	3.3%
混源区	XL101	Es₁	14.9%	37.8%	37.8%	9.5%
	XL8	Es₁	13.1%	26.2%	49.2%	11.5%
	XL8	Es₂	12.7%	47.9%	32.4%	7.0%

Fig.12 Distribution of Zircon ages in the 1st member of the Shahejie Formation, Lixian Slope, Raoyang Sag

Fig.13 Distribution of Zircon ages in the 2nd Member of the Shahejie Formation, Lixian Slope, Raoyang Sag

Fig.14 Distribution of sedimentary system in the 1st Member of the Shahejie Formation, Lixian Slope, Raoyang Sag

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