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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (11): 1723-1733.doi: 10.11764/j.issn.1672-1926.2022.08.003

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Analysis of effective gas source rocks of HZ26-6 oil and gas field in Pearl River Mouth Basin

Junzhang ZHU(),Chuang SHI(),Yuping HUANG,Xingye YANG,Yuling SHI,Xiaolong ZHANG   

  1. Shenzhen Branch of CNOOC Ltd. ，Shenzhen 518054，China
  • Received:2022-06-29 Revised:2022-08-08 Online:2022-11-10 Published:2022-11-23
  • Contact: Chuang SHI E-mail:zhujzh@cnooc.com.cn;shichuang@cnooc.com.cn
  • Supported by:
    The Major Scientific and Technological Project of CNOOC During the “14th Five Year Plan”(KJGG2022-0403);the Comprehensive Scientific Research Project of CNOOC Co., Ltd.(China)(KJZH-2021-0003-00)

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Abstract:

HZ26-6 structure, located in Pearl River Mouth Basin, has made a major breakthrough in oil and gas exploration in Mesozoic buried hills and Paleogene, which is the first large-scale discovery of condensate gas exploration in the buried hills, Enping Formation and Wenchang Formation of the basin. In order to further guide natural gas exploration in shallow water oil-rich areas, the effective gas source rocks under the third-order sequence framework of HZ26-6 oil and gas field were systematically studied by using the natural gas generation and molecular carbon isotope dynamics. The results show that the deep lacustrine source rocks of Wenchang VI formation and Wenchang V formation in Huizhou 26 Sag provide a large amount of natural gas for the buried hill reservoirs of HZ26-6 oil and gas field, the deep lacustrine source rocks in Wenchang V formation provide a certain amount of natural gas for the reservoirs of Wenchang Formation and Enping Formation, the deep lacustrine source rocks in Wenchang IV formation provide a small amount of natural gas for Wenchang Formation and Enping Formation, and the source rocks of upper Wenchang Formation (Wenchang III Formation) and Enping Formation basically do not provide natural gas. The gas field belongs to staged cumulative gas accumulation, and the reservoir formation time is relatively late. The effective filling and reservoir formation period is 10-0Ma. At present, it is still in the effective filling stage. This new understanding has important guiding significance for natural gas exploration in oil-rich areas of Pearl River Mouth Basin.

Key words: Pearl River Mouth Basin, Huizhou 26 Sag, HZ 26-6 oil and gas field, Kinetics of natural gas generation and molecular carbon isotope, Effective gas source rock

CLC Number: 

  • TE122.1

Fig.1

Structural location （a）， structural unit characteristics （b） and composite stratigraphic column （c） of Huizhou Sag in the Pearl River Mouth Basin"

Fig.2

Cross profile of HZ26-6 reservoir"

Fig.3

Characteristics of gas and bitumen generation and evolution in the thermal evolution process of source rocks of semi deep lake to deep lake subfacies in Wenchang Formation"

Fig.4

Characteristics of carbon isotope evolution of methane and ethane in the thermal evolution process of source rocks of semi deep lake to deep lake subfacies of Wenchang Formation"

Fig.5

Kinetic characteristics of methane generation in source rocks of semi deep lake to deep lake subfacies of Wenchang Formation"

Fig.6

Diagrams showing the sedimentary facies of the Wenchang Formation in the Huizhou 26 Sag"

Table 1

Molar content data of natural gas components in HZ26-6 oil and gas field"

天然气组分样品编号
恩平-1恩平-2文昌-1文昌-2潜山-1潜山-2潜山-3潜山-4潜山-5
二氧化碳0.1160.2680.0340.0740.0130.0100.0090.0370.968
氮气0.2640.2150.3160.2150.2420.1660.1520.1100.169
甲烷83.84983.47884.26676.63885.01480.69982.08786.00678.280
乙烷10.78010.86710.94112.8729.84111.22710.7999.65814.300
丙烷3.3863.5173.3205.7293.1764.3983.9842.8454.634
异丁烷0.5300.5830.4201.1450.6111.0040.8530.4840.748
正丁烷0.5680.6280.4641.6050.6301.1611.0040.4980.620
异戊烷0.1400.1580.0920.5930.2030.4800.3860.1420.140
正戊烷0.1000.1070.0670.5070.1410.3770.3120.1000.082
C6+0.2670.1790.0800.6220.1290.4780.4140.1200.059

Table 2

Carbon isotope data of natural gas components in HZ26-6 oil and gas field"

天然气组分样品编号
恩平-1恩平-2文昌-1文昌-2潜山-1潜山-2潜山-3潜山-4潜山-5
甲烷-40.755-40.702-40.666-40.479-38.692-39.151-38.692-38.672-40.007
乙烷-27.885-28.092-28.517-27.952-27.799-27.448-27.799-27.237-27.196
丙烷-25.159-25.631-26.374-25.747-25.245-25.259-25.245-24.878-24.817
异丁烷-31.76-27.111-29.484-27.233-26.545-26.986-26.545-26.495-27.396
正丁烷-25.028-24.709-25.230-24.566-24.610-24.814-24.610-24.107-24.058
异戊烷-26.026-25.719-26.110-25.577-25.517-25.575-25.517-25.288-25.390
正戊烷-24.316-24.234-24.278-23.825-24.032-23.895-24.032-23.975-22.874

Fig.7

Interface temperature and maturity evolution history of different tertiary sequences of Wenchang Formation in the central virtual Well A， in the center of Huizhou 26 Sag"

Fig.8

Comprehensive analysis diagram of methane conversion rate， methane carbon isotope evolution and measured methane carbon isotope value of natural gas corresponding to each third-order sequence of Wenchang Formation in Huizhou 26 Sag（cumulative gas accumulation model）"

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