Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (4): 507-517.doi: 10.11764/j.issn.1672-1926.2019.10.004

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Distribution characteristics and formation environment of high quality source rocks of Qiangzhusi Formation in northeastern Sichuan Basin

Shuai-jie YANG1(),Wei-feng WANG1(),Dao-liang ZHANG1,Xiao-dong FU2,Jian-yong ZHANG2,Wen-zheng LI2   

  1. 1.China University of Petroleum (Huadong), Qingdao 266580, China
    2.Hangzhou Research Institute of Geology, Hangzhou 310023, China
  • Received:2019-08-21 Revised:2019-10-04 Online:2020-04-10 Published:2020-04-26
  • Contact: Wei-feng WANG E-mail:s17010120@s.upc.edu.cn;wangwf@upc.edu.cn
  • Supported by:
    The China National Science and Technology Major Project(2017X05008005);The Major Science and Technology Projects of CNPC(2018A-0105)

Abstract:

The Lower Cambrian Qiongzhusi Formation source rocks are one of the most important source rocks in Sichuan Basin and its surrounding areas. In order to clarify the distribution and formation environment of the high-quality source rocks in Qiongzhusi Formation in northeastern Sichuan Basin, data of well logging, organic geochemistry and major-trace element are obtained and studied in this research. Our results show that the high-quality source rocks of Qiongzhusi Formation were formed in warm and humid deep-water shelf and slope-basin environment with relatively weak hydrodynamic force. These source rocks are stored in reducing to weak-oxidation environment, which provides the favorable sedimentary environment for the generation and preservation of organic matters. The source rocks are mainly developed in deeper layers in the longitudinal direction and horizontally have three thickness centers in Chengkou-Kaixian rift area, Bazhong-Tongjiang area and Wufeng-Hefeng area. These conditions lay important foundation of oil and gas formation. Besides, a good source-reservoir allocation relationship can be found between the source rocks and the high-quality reservoir rocks in Longwangmiao and Dengying Formation. The abundant distribution of both the reservoir rocks and source rocks in Chengkou-Kaixian area makes it an attractive location to be prospected in the future work.

Key words: High-quality source rocks, Distribution characteristics, Formation environment, Qiangzhusi Formation, Northeast Sichuan Basin

CLC Number: 

  • TE122.1

Fig.1

Geological sketch and location map of key wells/sections in northeastern Sichuan Basin"

Table 1

Data tables of main-trace elements, TOC and sedimentary environment indicators of source rocks of Qiangzhusi Formation in northeastern Sichuan Basin"

样品编号主量元素/%微量元素/(μg/g)

TOC

/%

古气候水动力氧化—还原条件生产力
SiO2Al2O3Fe2O3K2OCaOMgONa2OTiO2P2O5MnOSrCuZrCoNiRbMoThUSr/CuMg/CaZr/RbNi/CoU/ThMoP/Ti
MYZ-∈1q-B166.7910.886.052.221.161.291.391.070.270.0410081.0173.2211.3098.1065.006.206.807.102.851.230.942.668.681.046.200.19
MYZ-∈1q-B457.7813.578.092.250.081.131.741.400.230.0363168.0197.9219.50220.0074.0023.806.7019.877.410.3811.332.6711.282.9723.800.12
MYZ-∈1q-B865.809.564.202.293.811.631.820.500.140.041045145.060.336.5053.2061.003.504.905.322.797.210.110.998.181.093.500.74
MYZ-∈1q-B1053.506.412.831.8414.932.020.860.380.390.0373592.459.665.8045.3063.003.705.007.331.937.950.160.957.811.473.701.90
MYZ-∈1q-B1249.806.582.771.9016.153.120.620.350.920.0396581.249.965.7044.5051.601.904.104.451.4211.880.140.977.811.091.901.53
MYZ-∈1q-B1446.445.612.731.6619.113.220.570.320.660.031457190.049.185.6057.1053.106.404.009.852.687.670.120.9310.202.466.403.71
MYZ-∈1q-B1552.955.562.431.6015.492.170.570.281.440.031426101.058.306.9061.2065.003.704.609.832.6014.120.140.908.872.143.703.95
MYZ-∈1q-B1851.156.032.601.7116.272.640.730.321.720.03138097.449.475.3050.4052.403.503.806.681.5114.170.160.949.511.763.503.00
MYZ-∈1q-B2052.735.062.541.5116.453.020.540.271.100.03103292.228.812.1020.0026.301.302.2020.162.8011.190.041.109.529.161.3033.56
MYZ-∈1q-B2251.306.753.031.9915.173.350.660.370.370.03132281.659.077.5053.3069.505.404.907.191.6516.200.190.857.111.475.400.73
MYZ-∈1q-B2448.476.972.771.9216.572.980.820.350.320.03838157.068.647.7076.4076.0013.905.7012.842.565.340.150.909.922.2513.900.67
平均值54.257.543.641.9012.292.410.940.510.690.03942117.077.697.6370.8659.726.664.7910.062.758.850.211.268.992.446.664.55
LT1-∈1q-B1149.9712.535.454.233.830.690.680.235.680.0840663.5148.0016.6046.40115.007.437.924.000.546.390.571.292.800.517.430.24
LT1-∈1q-B1047.3011.964.793.834.080.730.620.1810.060.1036750.6141.0014.7047.20109.005.207.684.740.597.250.341.293.210.625.200.22
LT1-∈1q-B949.8612.414.864.133.830.630.630.218.520.0832749.2139.0015.0048.60107.003.827.634.800.606.650.381.303.240.633.820.24
LT1-∈1q-B842.149.664.783.113.380.820.530.3711.490.1064551.3110.0013.5046.1091.7023.406.214.660.7912.570.251.203.410.7523.400.50
LT1-∈1q-B748.3912.244.984.083.580.740.600.237.710.0841552.8123.0015.4051.80112.006.357.444.140.827.850.391.103.360.566.350.28
LT1-∈1q-B648.8213.194.964.243.850.620.600.169.680.0928450.3123.0015.0049.30124.004.787.843.970.725.640.340.993.290.514.780.19
LT1-∈1q-B554.5511.264.104.052.261.240.730.329.370.1021615.7192.009.9327.7087.502.118.283.020.2213.760.202.192.790.362.110.32
LT1-∈1q-B456.1513.594.305.063.301.210.720.254.380.1826419.9281.0012.9027.60102.003.0015.404.220.3713.270.642.752.140.273.000.26
LT1-∈1q-B350.019.813.963.412.541.150.650.4612.680.1826818.4194.009.2427.4073.006.667.823.320.2714.570.172.662.970.426.660.51
LT1-∈1q-B256.1812.383.895.133.181.230.830.213.990.1929230.2230.0014.0035.3098.804.929.612.800.419.670.672.332.520.294.920.18
LT1-∈1q-B153.0912.113.804.903.220.880.770.257.040.2128323.6194.0012.2029.20100.003.578.842.790.3111.990.391.942.390.323.570.24
平均值50.5911.924.534.203.370.900.670.268.240.1334238.7170.4513.5039.69101.826.488.613.860.519.970.391.732.920.486.480.29

Fig.2

Distribution profile of source rocks of Qiangzhusi Formation in northeastern Sichuan Basin"

Fig.3

Superposition map of high quality source rocks of Qiangzhusi Formation and reservoirs in northeastern Sichuan Basin"

Fig.4

Comprehensive column map of source rocks in key exploration wells/profiles of Qiangzhusi Formation in northeastern Sichuan Basin"

Fig.5

Oxidation-reduction index ω(U)/ω(Th)-ω(Ni)/ω(Co) intersection platform of Qiangzhusi Formation source rocks in northeastern Sichuan Basin"

Fig.6

TOC and oxidation-reduction index relationship diagram of source rock of Qiangzhusi Formation in northeastern Sichuan Basin"

Fig.7

Sedimentary facies and TOC characteristic distribution map of Lower Cambrian Qiongzhusi Formation in northeastern Sichuan Basin"

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