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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (11): 1798-1807.doi: 10.11764/j.issn.1672-1926.2022.06.001

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Division of base level cycle of Sangonghe Formation in block 1, central Junggar Basin

Geng FENG1,2(),Lihua XIE1,2,Jiwei LIU2,Jun WANG3,Weiping ZHANG4   

  1. 1.Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China
    2.School of Earth and Space Sciences，Peking University，Beijing 100871，China
    3.Oil and Gas Exploration Management Center of SINOPEC Shengli Oilfield Company, Dongying 257000, China
    4.SINOPEC Xinjiang Xinchun Oil Development Co. , Ltd. , Dongying 257000, China
  • Received:2021-09-24 Revised:2022-05-18 Online:2022-11-10 Published:2022-11-23

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Abstract:

The Sangonghe Formation (Junzhong block 1) in central Junggar Basin is an important exploration area for oil and gas in continental strata. During the sedimentary period of Sangonghe Formation, Junzhong 1 block deposited a set of relatively stable shallow water delta-lakeside facies strata. The Junggar Basin was in a tensional tectonic environment during the Jurassic sedimentary period. The basin has the sedimentary characteristics of large basin, shallow water and slow slope, so it is difficult to determine the high resolution sequence stratigraphic ratio in the seismic profile of the basin abdomen. The method of wavelet transform and synthetic prediction error filtering analysis of GR logging curve, is used by high resolution sequence stratigraphy division. The optimal scale factor(a) of wavelet transform was identified in a single well, corresponding to short-term cycle, medium-term cycle and long-term cycle respectively. The larger the energy of scale factor was, the more drastic the change of GR logging curve value was, and it was determined as water inflow surface or water retreat surface. Based on synthetic predictive error filtering, negative inflection point and positive inflection point are identified in the Sangonghe Formation. The negative inflection point indicates the initial water flooding surface, and the positive inflection point indicates the maximum water flooding surface. According to the negative trend and positive trend of synthetic prediction error filter curve, the cyclicity of sedimentary strata can be distinguished. The base level analysis of Sangonghe Formation in Junzhong 1 block confirms that wavelet transform and synthetic prediction error filtering analysis have good application effect and application prospect in continental strata research. Based on the analysis of sedimentary process of base level cycle, it is pointed out that the second member of Sangonghe Formation is the main sandbody development horizon and is the key exploration direction.

Key words: Junzhong 1 block, Base level, Morlet wavelet transform, INPEFA curve analysis, Shallow water delta

CLC Number: 

  • TE132.1

Fig.1

Structural unit division of Junggar Basin and location of the study area"

Fig2

Characteristics of typical logging facies combination in Junggar Basin belly"

Fig.3

Long term base level cycle characteristics of Sangonghe Formation"

Fig.4

Distribution of optimal scale factor（a） of wavelet transform in Well Sha11"

Fig.5

Fine stratigraphic correlation of INPEFA curve in Sangonghe Formation"

Fig.6

Circular column diagram of comprehensive formation of Well Sha1"

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