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Study of Sequence Stratigraphy and Forecast of Favorable Reservoir in Es2 in Niuzhuang Sag

Author: ZhaoWei
Tutor: QiuLongWei
School: China University of Petroleum
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Niuzhuang sag Es2 sequence stratigraphy lower contained vacuity delta
CLC: P539.2
Type: Master's thesis
Year: 2008
Downloads: 203
Quote: 1
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Abstract


Through the relevant data such as the core description , well-log and seismic analysis , this paper has studied the sequence division and evolution , the facies marks feature, the facies type and its distribution rules of the upper segment of Es3～Es2 in Niuzhuang sag on the basis of the sequence stratigraphy and sedimentology.Under the guide of the sequence stratigraphy theory, the sequence boundaries about the upper segment of Es3～Es2 have been recognized and further divide it 2 sequences: the upper segment of Es3-lower segment of Es2 is S1 sequence , the upper segment of Es2 is S2 sequence .The upper segment of Es3～Es2 is divided into 21 parasequence , which include 6 parasequence formation on the studies of the core description , well-log and seismic and the other relevant data , combining with wavelet analysis.The S1 sequence is a dichotomize sequence,include the TST and the RST, further divided 3 parasequence formations and 9 parasequence. The sequence formations are entitled S1-1 , S1-2 and S1-3 from the bottom to the top, included the 13-21 parasequence: the parasequence 20-21 pertain S1-1, the parasequence 16-19 pertain S1-2, the parasequence 13-15 pertain S1-3. The S2 sequence is a tripartition dichotomize sequence ,include the LST ,TST and HST, further divided 3 parasequence formations and 12 parasequence. The sequence formations are entitled S2-1 , S2-2 and S2-3 from the bottom to the top, included the 1-12 parasequence: the parasequence 10-12 pertain S2-1, the parasequence 7-9 pertain S2-2 , the parasequence 1-6 pertain S2-3. The S2-1 parasequence formation corresponds to the LST of S2, S2-2 and S2-3 correspond to TST. The sequence framework of the upper segment of Es3～Es2 in Niuzhuang sag has been established on the basis of individual well sequence division and well tie section.There are delta , meandering river , beach bar and lacus facies in upper segment Es3～Es2 of Niuzhuang sag by the relevant data such as the core description , well-log and log data. The channel of meandering river, the distributary channel of delta front ,distributary mouth bar , distal bar and the beach bar are the main sand body types. The provenance of delta is the eastern and south slope of the sag. The sand body distribute is controlled by the palaeobathymetry and hydrodynamic force in plane, and influenced by the change of water of lacus basin in the longitude.In order to comprehend the feature of delta in lower contained vacuity ,this paper investigate the delta sediment feature of Deposit pool delta in DongYing , then draw certain knowledge , on this basis comparing with the delta of the upper segment of Es3～Es2 in Niuzhuang sag , in the end generalize the model about delta which deposits in lower contained vacuity. The fruit of this paper provides direction for the exploration activity in Es2 of Niuzhuang sag , also is benefit to the study of the delta depositional system in the same deposition condition

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CLC: > Astronomy,Earth Sciences > Geology > Historical geology, stratigraphy > Various types of stratigraphy > Sequence stratigraphy
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