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Prediction Study on Traps Within The Third Sand Set of S-1 Member of Shawan Formation in Chunguang Block, Junggar Basin, China

Author: WangMu
Tutor: XuGuoQiang
School: Chengdu University of Technology
Course: Mineral prospecting and exploration
Keywords: Spring block Shawan Class I sandstone Earthquake sandbody scan Lithology - stratigraphic traps
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 2
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Abstract

Spring block is located in the Junggar Basin Chepaizi raised. Oil and gas exploration in the area began in the 1950s of the last century, when the exploration targets mainly concentrated on the Cretaceous, Jurassic, Permian even deeper Carboniferous, the shallow Neogene almost no attention. 2005 Shengli Oilfield in the west of the rupture of the red car Chepaizi block drilling, row 2 wells stumbled on Neogene Shawan lightweight reservoir, thus opening a Tertiary light oil exploration prelude. Follow-up exploration indicates that, the regional shallow Chepaizi Shawan (N ₁ s) has good exploration potential. And early exploration of \In this paper, the use of the study area logging, drilling data the synthetic seismogram production and drilling sequence division, nearly more than 1,000 square kilometers of 3D seismic data, well data constraints, on the basis of previous studies, well - shock contrast, seismic line drawing, even the well profile sequence division contrast, build the Shawan sequence stratigraphic framework; On this basis, by extracting sand mudstone speed value, clear the sand for a period of sandstone type, and then use The waveform analysis earthquake sand body scanning technology to carry out its target layer of sand body scan, the ultimate combination of seismic facies - sedimentary facies analysis, clear depositional system type, to predict the distribution of favorable reservoir facies and effective trap. The study achieved the following progress and understanding of: 1) the initial formation of a waveform analysis, earthquake sand body scanning technology identified on seismic profiles sand body, by sand body tracking scan and then show sand sets the sand body distribution characteristics; 2) leveled the top of the spring, spring, spring 8 and row of 8 wells of a single well layer sequence division, as well as the study area three well profile Shawan Formation processing, combined with even the well profile comparison results, comprehensive analysis, Shawan (N ₁ s) is divided into three third-order sequences, each sequence by LST, TST, HST and FSST4 systems tract, build Shawan Formation sequence stratigraphic framework, the basic clear Shawan mainly of delta and lake sediments, the initial implementation of the facies belts and distribution of sand bodies; 3) seismic line drawing method, summed up a the Shawan period of (N ₁ s ^{1 ) stratigraphic sequence stratigraphic frame mode, to further clarify the distribution of sand body within the framework: development mainly in the low and lake regression formed during the slope fan, floor fan and lake retreat formed during the offlap isolated sand body, and the body of the delta front and on both sides of the river near the shoreline area of ??sand; 4) 16 wells by extracting the sand-shale speed data, the preparation of Shawan section of sandstone and mudstone compaction curves, reveal the the sand some sandstone speed is generally lower than mudstone, filling the oil and gas after speed value lower this law, belonging to NA Anstey thought I sand body lay the theoretical foundation for the late waveform analysis and seismic sand body scan; 5) earthquake sand body scanning technology (based waveform analysis to identify sand body), defined the N ₁ s ₁ ^{3 sand body distribution, combined with sequence stratigraphic framework and earthquakes - sedimentary facies, a comprehensive analysis that: Shahejie deposition of the development of the delta lobes - slope fan - floor fan depositional system, consisting of the paragraph development of a total of four times the sand sets, while the N ₁ s ₁ ^{3 a; 6) in the case of the basic implementation of the distribution of sand body, combined with the trap evaluation conditions, N ₁ s ₁ ^{3 < / sup> predicted the three larger lithologic and stratigraphic trap of class, the reservoir sands shoal, slope fan delta front lake retreat sand, and the fault is the most important oil and gas migration pathways . The combination of the spring 8 well drilling, a comprehensive analysis that has formed a certain scale reservoir potential of the three traps can be used as the target of further exploration.}}}}

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