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Research on Favorable Area Prediction of the Wutonggou Formation in Jimusaer Sag of Junggar Basin

Author: WangHouKun
Tutor: XuGuoQiang
School: Chengdu University of Technology
Course: Mineral prospecting and exploration
Keywords: Jimusaer depression Indus ditch group Sedimentary facies Reservoir Characteristics
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 116
Quote: 1
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Abstract

Jimusaer depression in eastern Junggar Basin, the east of the ancient West bulge, bump north of Sacchi, south of Fukang fault zone, west Beisantai bulge, an area of ??about 1278km ~ 2. In recent years, exploration results show that the purpose of the district is mainly Indus ditch layer group, and the area is in structural highs, oil migration is a long-term point area, with good exploration prospects. Structural traps in the study area is not developed, but there is from west to east the Indus ditch groups overlap pinch, easy to form stratigraphic traps, such trap identification more difficult. How to identify lithologic traps in the area to provide a basis is an urgent problem. This comprehensive application of seismic, logging, laboratory analysis and other information, conduct seismic wells combined well to seismic interaction analysis, in the previous studies based on the drilling sequence stratigraphy and seismic reflection termination of a variety of phenomena carried out sequence boundary identification system domain partition by sedimentary facies identification, characteristics of the study area reservoir facies belts were analyzed. The main knowledge obtained as follows: 1) According to the drilling sequence stratigraphy, seismic reflection termination on various phenomena in the study area Indus sedimentary strata of the ditch sequence stratigraphy, the entire group is a ditch Indus three sequences, which they can be divided into two four sequences, ie a group and the Indus Indus ditch ditch group Sec. Indus ditch group has developed LST, transgressive systems tract and HST. LST mainly developed low steep slope fans and incised valley, by a large set of conglomerate composed of seven wells drilling cross section Kyrgyzstan LST sedimentary characteristics evident; transgressive systems tract consists of braided river delta and fan-delta facies gray sandstone , pebbly sandstone and mudstone; HST mainly by gray mudstone, sandstone and sandy mudstone. Group is stable ditch Indus basin subsidence, because of the terrain leveled off a large area of ??shallow water deep lake facies, with some areas in the development of steep fan delta system. 2) Through the Indus ditch Jimusaer depression group Permian sequence stratigraphic analysis, in the study area, pick out a few mouthfuls of different locations typical wells, made four stratigraphic correlation section and this section do a comparative analysis of four, reflecting the eastern slope of the study area Sedimentary characteristics and sequence evolution. 3) through sedimentary facies and reservoir studies, combined with the 90 ° phase shifting, multi-attribute analysis and seismic inversion techniques such as determining reservoir prediction techniques developed three Jimusaer depression facies belts. I band is mainly fan delta unloading area, debris content better, and greater depth, physical property is medium, but away from the eastern slopes denuded zone Jimusaer depression, reservoir storage conditions better, Ⅱ, Ⅲ with major in the slope area, hydrodynamic conditions were better, coupled with shallow depth of burial, physical condition is good. 4) on the Indus ditch Jimusaer Permian depression group as a whole, with the following rules, provenance from the south, the southern reservoir conditions better than the north; affected by compaction, higher than the area of ??the Indus Kat 17 wells ditch group good reservoir properties; small faults on the internal development of oil and gas vertical migration favorable; Indus ditch group is truncated Jurassic reservoir storage conditions of its better than being truncated Paleogene.

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