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Sedimentary Characteristics Study on Lower Cretaceous of Saihantala Sag, Erlian Basin

Author: ChengYanQing
Tutor: MaoXiaoPing
School: Chinese Geology University (Beijing)
Course: Mineral prospecting and exploration
Keywords: Seismic facies Sedimentary facies Stratigraphic units Sequence stratigraphic framework Log facies Structural geology
CLC: P534.53
Type: Master's thesis
Year: 2010
Downloads: 223
Quote: 1
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Abstract


Erlian Basin exploration areas in order to further expand and improve the success rate of exploration, this paper the Erlian Basin Saihantala depression as a study area. Depression internal basic geological data Saihantala, core data, logging plans, seismic data combined with a single well facies analysis and cross-section compared sedimentology and petroleum geology disciplines strata in the study area, provenance, sand body planar distribution characteristics of key research, analysis and sedimentary facies characteristics of the study area and the distribution rule to determine the key layers of sedimentary facies type, provide the basis for the next step in the oil and gas exploration. Stratigraphic correlation section shows a thin features Arxan and Stengel group has a clear East thick West. The strong boundary fault the cylinder rupture of tectonic activity and rapid sinking very thick deposited in the fracture Central Aershan Formation, and Teng MUDSTONE, hydrocarbon source rock oriented depression has laid a solid foundation. The cylinder rupture downthrown deposited from the eastern part of multiple near-crony-like distribution underwater fan, the lakebed fan fan body. Combined Teng Sec race Han group during the deposition of sediments rich source, provides good conditions for oil and gas reservoirs. The sedimentary facies analysis show that the region developed fan-delta plain, fan delta front subfacies, former fan delta subfacies sublacustrine fan, lacustrine and braided river delta plain subfacies. Arxan a lesser extent during the deposition of the lake, littoral and shallow lake. Sufficient the late northwest matter source, mainly deposited in braided river delta, the long axis of the South and the North, mainly developed mainly in deltaic sediments deposited deposited mainly in the direction of the minor axis of the things by underwater fan, fan delta. During this period, the lake basin interior and eastern steep bank and deposited thick lake with dark mudstone deposition, to become the first set of source rocks in this depression. Teng period of the deposition period, lacustrine mudstones deposited mainly huge thickness. The massive fan delta front sediments in race the 4 East subsags, the formation of eastern provenance thickness easy to hydrocarbon accumulation. The long axis in the north and south of the lake basin, dominated deltaic sediments. Teng Sec deposition period western gentle slope with a larger fan delta deposition, the eastern steep bank nearshore subaqueous fan fan bodies sublacustrine fan. The eastern steep slopes with the the lakebed fan and subaqueous fan sandstone body near the source rocks, lithologic traps easy to form, and the significance of the oil and gas exploration.

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CLC: > Astronomy,Earth Sciences > Geology > Historical geology, stratigraphy > History of each era to its stratigraphic > Mesozoic ( circles ) > Cretaceous ( the Department )
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