Dynamic accumulation of a high-grade gas hydrate system: insights from the trial production gas hydrate reservoir in the Shenhu area, northern South China Sea

被引:0
作者
Zhang, Wei [1 ,2 ,3 ]
Liang, Jinqiang [1 ,2 ,3 ,4 ]
Su, Pibo [1 ,2 ,3 ]
Meng, Miaomiao [2 ,3 ,4 ]
Huang, Wei [2 ,3 ,4 ]
Liu, Pengqi [1 ,3 ]
Yuan, Sheng [1 ,3 ]
Ji, Chunsheng [1 ,3 ]
机构
[1] China Geol Survey, Guangzhou Marine Geol Survey, Sanya Inst South China Sea Geol, Sanya, Peoples R China
[2] Natl Engn Res Ctr Gas Hydrate Explorat & Dev, Guangzhou, Peoples R China
[3] China Geol Survey, Acad South China Sea Geol Sci, Sanya, Peoples R China
[4] China Geol Survey, Gas Hydrate Engn & Technol Ctr, Guangzhou, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Hydrate recycling; dynamic accumulation mechanism; mud diapir associated fault; coexistence of hydrate and free gas; hydrate preservation; trial production; Shenhu area; South China Sea; KRISHNA-GODAVARI BASIN; RIVER MOUTH BASIN; FLUID-FLOW; OFFSHORE PRODUCTION; GEOLOGICAL CONTROLS; CONTINENTAL-MARGIN; BEARING SEDIMENTS; METHANE HYDRATE; STABILITY ZONE; NANKAI TROUGH;
D O I
10.3389/fmars.2024.1418716
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The ultimate enrichment level and quantity of gas hydrate resources are influenced by the dynamic process of accumulation and preservation. High-resolution 3-D seismic data, logging while drilling (LWD), pressured coring, and in situ testing were used to characterize the dynamic accumulation and preservation of the trial production high-grade gas hydrate reservoir (HGGHR) in the Shenhu area. Through seismic variance analysis and ant-tracking, we found that newly identified mud diapir-associated faults with three development stages controlled the migration and accumulation of gas hydrate and shifted the base of the gas hydrate stability zone (BGHSZ), resulting in dynamic accumulation and dissociation of gas hydrates. The recognized double bottom simulating reflectors (BSRs) were concluded to have been formed due to the shift of the BGHSZ caused by the variational equilibrium conditions. The interval between the double BSRs was inferred to be a disequilibrium zone where gas recycling occurred, contributing to the coexistence of gas hydrates and free gas and the dynamic formation of the HGGHR. Multiple gliding faults formed within the GHSZ in the late period have altered the HGGHR and control the present thickness and distribution of the gas hydrates and free gas in the hanging wall and footwall. Under the influence of geothermal fluids and the fault system associated with the mud diapir, the HGGHR experienced dynamic accumulation with three stages, including early accumulation, medium-term adjustment, and late alteration and preservation. We conclude that four factors affected the formation, distribution, and occurrence of the HGGHR: the geothermal fluids accompanying the deep mud diapir below the reservoir, the dual supply of thermogenic gas and biogenic gas, the recycling of hydrate gas beneath the BGHSZ, and the post-gas hydrate faults developed within the GHSZ. A geological model illustrating the dynamic formation of the trial production HGGHR was proposed, providing a reference for future exploration of HGGHRs with a great production potential in deepwater settings.
引用
收藏
页数:20
相关论文
共 93 条
  • [1] Akihisa B. B., 2002, SPWLA 43rd Annual Logging Symposium
  • [2] Seismic evidence of gas hydrates, multiple BSRs and fluid flow offshore Tumbes Basin, Peru
    Auguy, Constance
    Calves, Gerome
    Calderon, Ysabel
    Brusset, Stephane
    [J]. MARINE GEOPHYSICAL RESEARCH, 2017, 38 (04) : 409 - 423
  • [3] Bohrmann G, 1998, GEOLOGY, V26, P647, DOI 10.1130/0091-7613(1998)026<0647:ACFTCS>2.3.CO
  • [4] 2
  • [5] Boswell R, 2006, NATURAL GAS OIL, V304, P285
  • [6] India National Gas Hydrate Program Expedition 02 summary of scientific results: Evaluation of natural gas-hydrate-bearing pressure cores
    Boswell, Ray
    Yoneda, Jun
    Waite, William F.
    [J]. MARINE AND PETROLEUM GEOLOGY, 2019, 108 : 143 - 153
  • [7] Geological controls on the Storegga gas-hydrate system of the mid-Norwegian continental margin
    Bünz, S
    Mienert, J
    Berndt, C
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 2003, 209 (3-4) : 291 - 307
  • [8] Bybee K, 2004, J PETROL TECHNOL, V56, P53
  • [9] Three dimensional seismic studies of deep-water hazard-related features on the northern slope of South China Sea
    Chen, Duanxin
    Wang, Xiujuan
    Voelker, David
    Wu, Shiguo
    Wang, Lei
    Li, Wei
    Li, Qingping
    Zhu, Zhenyu
    Li, Cuilin
    Qin, Zhiliang
    Sun, Qiliang
    [J]. MARINE AND PETROLEUM GEOLOGY, 2016, 77 : 1125 - 1139
  • [10] Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs
    Chen Duanxin
    Wu Shiguo
    Dong Dongdong
    Mi Lijun
    Fu Shaoying
    Shi Hesheng
    [J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, 2013, 31 (01) : 178 - 189