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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (7): 1025-1035.doi: 10.11764/j.issn.1672-1926.2022.02.004

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New discoveries and exploration prospects of Middle and Lower Jurassic lithologic reservoirs in depression area of Turpan-Hami Basin

Haiqing HE1(),Shijun LIANG2,Xujie GUO1,Quansheng LUO2,Jufeng WANG3,Xuan CHEN2,Fan YANG3(),Dongsheng XIAO4,Hua ZHANG4   

  1. 1.PetroChina Exploration & Production Company，Beijing 100007，China
    2.PetroChina Tuha Oilfield Company，Hami 839009，China
    3.Research Institute of Exploration and Development，PetroChina，Beijing 100083，China
    4.Research Institute of Exploration & Development，PetroChina Tuha Oilfield Company，Hami 839009，China
  • Received:2021-12-28 Revised:2022-02-10 Online:2022-07-10 Published:2022-07-11
  • Contact: Fan YANG E-mail:hehq@petrochina.com.cn;yf2010@petrochina.com.cn
  • Supported by:
    The Major Science and Technology Project of CNPC(2022DJ2107);the Major Science and Technology Project of Key Factors of Tuha Oilfield Company(2022E-01-02)

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Abstract:

Recently， risk exploration Well Qintan1 and exploration Well Ji7H in the Turpan-Hami Basin have made important discoveries in the Lower Jurassic Sangonghe Formation in Taibei Sag. The two wells realized a major breakthrough in lithologic oil and gas reservoir exploration in depression area， and showed a good prospect of “lower depression source” exploration in Turpan-Hami Basin. Based on the two wells， the favorable conditions of lithologic reservoir formation in the sag area are systematically summarized， and the directions of further exploration are specified. The results show that： （1） Three sets of source rocks， namely Badaowan Formation， Sangonghe Formation and Xishanyao Formation， are developed in Shuixigou Group of Jurassic in Taipei Sag. The new drilling reveals that Sangonghe Formation is not only a regional caprock， but also a high-quality source rock. The source rock re-evaluation shows that Shuixigou Group in Taipei Sag has great hydrocarbon generation potential. （2） Sangonghe Formation of Lower Jurassic is the main target layer for exploration in the depression area. Braided river delta sediments are developed. Sandbodies are developed in the depression area. Due to secondary dissolution and structural fractures， effective reservoirs are still developed at a depth of more than 5 000 m. （3） There are five favorable zones of rock reservoirs in the Lower Jurassic of Taibei Sag： Pudong， Hongbei， Lingbei， Qiudong and Gebei， which have great exploration potential and are an important direction of future exploration in Turpan-Hami Basin.

Key words: Turpan-Hami Basin, Lithologic reservoirs, Coal-bearing source rock, Braided river delta, Risk exploration

CLC Number: 

  • TE122.1

Fig.1

Jurassic structural units， exploration results map and Jurassic comprehensive histogram in Turpan Depression，Turpan Hami Basin"

Fig.2

Geochemical profile of Shuixigou Group in Well Qintan 1"

Table 1

Geochemical indexes of source rocks of Shuixigou Group in Taipei Sag, Turpan Hami Basin"

凹陷层系岩性面积/km2厚度/mTOC/%（S1+S2）/（mg/g）IH/（mg/g）RO/%
胜北J2x泥岩4 311100~400（0.51~5.16）/1.98（0.48~15.26）/3.34（43~318）/180（0.5~1.0）/0.7
煤1 08340~100（41.96~76.13）/57.5（43.7~93.74）/74.75（93.5~47.6）/119
J1s泥岩1 33750~180（0.4~11.97）/1.52（0.15~18.21）/2.8（31~329）/180（0.64~0.83）/0.73
J1b泥岩4 205100~150（0.5~5.72）/1.59（0.48~32.65）/3.74（20.34~447）/124（0.7~0.97）/0.82
煤33020~4059.9221.63264.31
丘东J2x泥岩2 612100~600（0.5~7.81）/1.9（0.52~57.53）/7.12（11.63~392.86）/144（0.51~1.21）/0.75
煤1 74540~140（14.4~83）/42（15.78~222.52）/66（89~334）/151
J1s泥岩1 179100~180（0.27~11.76）/1.26（0.11~33.29）/5.12（95~392）/175（0.5~1.1）/0.82
J1b泥岩1 567100~250（0.52~4.55）/1.26（0.5~26.65）/4.4（28.57~950）/112（0.67~1.3）/1.1
煤41620~6067.9170.81226
小草湖J2x泥岩2 465100~400（0.56~5.65）/1.44（0.5~43.24）/4.55（24~291）/127（0.5~1.15）/0.78
煤1 55340~12050.770.1425
J1s泥岩1 18450~150（0.17~2.26）/0.73（0.03~2.12）/0.47（2.2~74.4）/26.4（0.6~0.97）/0.73
J1b泥岩1 038100~200（0.51~3.51）/1.2（1.35~10.93）/3.15（41~93）/68（0.6~0.97）/0.73

Fig.3

Mudstone thickness of J1s in Taibei Sag， Turpan Hami Basin"

Fig.4

Gas generation histogram of source rocks of Shuixigou Group in Taipei Sag， Turpan Hami Basin"

Fig.5

Sedimentary facies diagram of J1s in Turpan Depression， Turpan Hami Basin"

Fig.6

Wells Ji 7， Qintan 1 and Putan 1 reservoir micrograph of J1s"

Fig.7

Porosity-depth relationship of Sangonghe Formation in Taipei Sag"

Fig.8

NE seismic profile through Shengbei Depression， Taibei Sag（see section② in Fig.1 for the location）"

Fig.9

Comprehensive evaluation map of J1s in Taipei Sag"

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