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The Western Slope Gaotaizi reservoirs in northern Songliao Basin high-resolution sequence stratigraphy and lithologic traps forecast

Author: MaJunXia
Tutor: WuFaDong
School: Chinese Geology University (Beijing)
Course: Stratigraphy and Paleontology
Keywords: Sequence Resolution Sequence Sedimentary facies Strata - lithologic traps
CLC: P539.2
Type: Master's thesis
Year: 2005
Downloads: 203
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Abstract


The western slope is a secondary tectonic units of the northern Songliao Basin region there are more than 260 exploratory wells. For a long time due to various reasons and did not conduct an overall study. In order to adapt to the need for further exploration and development of the subject for the study to the entire ramp area, the use of seismic, logging, rock, electric, paleontology, heavy mineral data, combined with a large number of core observation on the high oil layer (the green twenty-three segment xintaizi) The four high-resolution sequence division, four system tracts as units prepared in the plane of the phase diagram, and the final four system tracts stratigraphic unit forecast - lithologic traps. In terms of sequence division, first through the synthetic recording electrical measuring characteristics paleontological features, characteristics of heavy minerals as well as the core characteristics, two, three sequence boundaries identified in the seismic profiles, electrical measuring curve, these sequence boundaries in purpose layer coincide with the four sequence boundaries. The research purposes layers existence of a secondary interface, the interface of the two third-order sequences. Due to the resolution limit of the seismic data, four sequence boundaries are difficult to identify on the seismic section, only in accordance with the characteristics of rock electrical and supplemented core features. Combined with ostracods with sand group divided research, by drilling data lithology - electrical, cycles and cycles cause analysis, divided four-layer sequence and four-sequence system tracts. Eventually identified five four sequence in the target layer, summed up the the rock electrical characteristics of the 10 four interface. The sequence with the well profile and the thickness of the sequence plane diagram summarizes four sequence space distribution law things up in order from east to west at all levels of sequence thinning and pinch out north and south up no apparent regularity. Sequence stratigraphy based on the comprehensive utilization of core, mud logging, well logging, seismic and analysis of laboratory data of the study area deposition system. First 24 core observation wells, and in conjunction with other data establishing relative micro-phase, the subfacies identification mark, the purpose of the study area segment mainly delta front and shore shallow lake sediments. Then for the unit to four systems tracts of sequence, the preparation of the 10 deposition plane phase diagram summarizes the law and depositional model of the sedimentary evolution of the study area. Finally, studies based on sequence stratigraphy and sedimentary facies to four sequence for unit, to predict the of favorable lithology - stratigraphic traps phase with distribution. Lithologic traps in the purpose section of the study area C1 ~ C3 sequence sandstone lens-based main to pour pinchout type C4 ~ C5 sequence.

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