干旱区生态环境知识资源中心(Arid): Formation Conditions and Sedimentary Model of Over-Flooding Lake Deltas within Continental Lake Basins: An Example from the Paleogene in the Jiyang Subbasin, Bohai Bay Basin

Arid

	Formation Conditions and Sedimentary Model of Over-Flooding Lake Deltas within Continental Lake Basins: An Example from the Paleogene in the Jiyang Subbasin, Bohai Bay Basin
	Wang Jian; Cao Yingchang; Liu Huimin; Gao Yongjin
来源期刊	Acta Geologica Sinica
ISSN	1000-9515
出版年	2015
卷号	89 期号:1 页码:270-284
英文摘要	A large quantity of drilling core, paleontology, geochemistry and geophysics data revealed several features of the Jiyang subbasin during the deposition of the Ek1-Es4 x members:(1) the paleotopography of the gentle slope belt had an extremely low gradient;(2) the paleoclimate frequently alternated between dry and wet periods in a generally arid setting;(3) there was strong weathering around the periphery of the basin;(4) the lake was very shallow;(5) the lake level frequently rose and fell; and(6) the sedimentary environment of the gentle slope belt was an overflooding lake. All of these factors provided favorable geological conditions for the development of an over-flooding lake delta. The lithologies of the continental over-flooding lake delta deposits are complex and diverse. The compositional maturity is moderate to low, and the grain size distribution curves and sedimentary structures indicate the presence of both gravity and traction currents. The sedimentary microfacies associations consist of a combination of ordered superposition of flood channels, distributary channels and sheet sands. The delta exhibits a weak foreset seismic reflection. The over-flooding lake delta deposits are laterally extensive. The sandstone content is high, and the individual sandstone beds are thin. The flood channel and distributary channel deposits exhibit evidence of bifurcation and lateral migration. The distribution of the sandbodies and the oxidation color of the mudstones provide evidence of cyclic deposition. The paleoclimate was the dominant factor controlling the development of the over-flooding lake delta. Due to the frequently alternating wet and dry paleoclimates, the over-flooding lake delta is characterized by the development of a broad upper plain and a lower delta plain. The upper delta plain is characterized by flood channel deposits, whereas the lower delta plain is represented by distributary channel deposits. The transition zone is characterized by the interaction of flood channels and distributary channels. Due to fault activity, the sandbodies of the over-flooding lake delta were juxtaposed against hydrocarbon source rocks, which was favorable for the development of lithologic reservoirs or structural-lithologic reservoirs. The lower delta plain deposits comprise the most favorable reservoirs.
英文关键词	Jiyang subbasin continental basin over-flooding lake delta sedimentary model oil and gas exploration
类型	Review
语种	英语
收录类别	CSCD
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5394480
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335479
作者单位	Wang Jian, School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China.; Cao Yingchang, School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China.; Liu Huimin, Institute of Geology, Sinopec Shengli Oil Field Company, Dongying, Shandong 257015, China.; Gao Yongjin, Institute of Geology, Sinopec Shengli Oil Field Company, Dongying, Shandong 257015, China.
推荐引用方式 GB/T 7714	Wang Jian,Cao Yingchang,Liu Huimin,et al. Formation Conditions and Sedimentary Model of Over-Flooding Lake Deltas within Continental Lake Basins: An Example from the Paleogene in the Jiyang Subbasin, Bohai Bay Basin[J],2015,89(1):270-284.
APA	Wang Jian,Cao Yingchang,Liu Huimin,&Gao Yongjin.(2015).Formation Conditions and Sedimentary Model of Over-Flooding Lake Deltas within Continental Lake Basins: An Example from the Paleogene in the Jiyang Subbasin, Bohai Bay Basin.Acta Geologica Sinica,89(1),270-284.
MLA	Wang Jian,et al."Formation Conditions and Sedimentary Model of Over-Flooding Lake Deltas within Continental Lake Basins: An Example from the Paleogene in the Jiyang Subbasin, Bohai Bay Basin".Acta Geologica Sinica 89.1(2015):270-284.