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Collaborating Authors
Tian, Jianzhang
Great Breakthroughs and Key Technologies in Exploration of Ordovician Deep Buried Hill in Northern Jizhong Depression
Zhang, Yiming (CNPC Huabei Oilfield Company) | Tian, Jianzhang (CNPC Huabei Oilfield Company) | Yang, Dexiang (CNPC Huabei Oilfield Company) | Chen, Shuguang (CNPC Huabei Oilfield Company) | Liu, Xing (CNPC Huabei Oilfield Company) | Hou, Fengxiang (CNPC Huabei Oilfield Company) | Tian, Ran (CNPC Huabei Oilfield Company) | Zhang, Chuanbao (CNPC Huabei Oilfield Company)
Abstract The study area is located in the Langgu sag of Northern Jizhong depression, Bohai Bay Basin, East China. In order to achieve exploration breakthrough in deep buried hill, key engineering technologies are developed and used to accurately demonstrate important target identification by recognizing new hydrocarbon accumulation patterns resulting from the analysis of multi-stage structure-controlled trap mechanism and the detailed study of controlling factors over high-quality Ordovician reservoirs based on new high-accuracy 3D seismic data. This study reveals a new evolution mechanism of buried hill controlled by structural superposition, experiencing "the uplift from thrusting in Indo-Chinese to early Yanshan epoch, uplifted block faulting into horsts in middle Yanshan epoch, horsts tilting into belt in Eocene, and belt reversion into trap", and thus puts forward a new mechanism for reservoir forming controlled by a superposition of "dolomite, karsting, and faulting". Three types of reservoir development are identified, including "regional layered pore, local block micropore-fracture, and fracture hole pore layer-block composite", and an accumulation pattern in deep buried hill is constructed, characterized by "efficient hydrocarbon supply from gas-type source rock, predominant migration through fractured surface-nonconformity surface, and stratum- and mass-controlled accumulation", which has guided the 40 years' exploration of Ordovician Yangshuiwu buried hill zone and made a great breakthroughs. Novel relevant exploration technologies have been developed, involving high-accuracy imaging, high-precision well logging identification of hydrocarbon reservoir, ultra-high temperature deep drilling and completion, ultra-high temperature carbonate reservoir stimulation, etc, which solve a worldwide problem that has restricted the exploration of the ultra-high temperature buried hill for many years. These technologies make possible the highest daily production of over 100 m oil and 0.5 million m gas respectively and sustain a high and stable production for a long term, which guarantee the clean energy supply for Beijing-Tianjin-Hebei region.
- Phanerozoic > Paleozoic > Ordovician (0.93)
- Phanerozoic > Cenozoic (0.90)
- Geology > Structural Geology > Tectonics (1.00)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.88)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Dolomite (0.36)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (0.54)
- Geophysics > Seismic Surveying > Seismic Processing (0.46)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.47)
- Asia > China > Hebei > Bohai Basin > Huabei Field (0.99)
- Asia > China > East China Sea > Bohai Basin > Jiyang Basin > Guantao Formation (0.99)
- Asia > China > Bohai Basin (0.99)
- Asia > China > Bohai Bay > Yellow River Mouth Sag > Bohai Basin > Jiyang Basin > Bozhong Field (0.95)
Two-parameter prestack seismic inversion of porosity and pore-structure parameter of fractured carbonate reservoirs: Part 2 — Applications
Zhang, Tingting (BP America) | Zhang, Ruifeng (Huabei Oilfield Company) | Tian, Jianzhang (Huabei Oilfield Company) | Lu, Lifei (Huabei Oilfield Company) | Qin, Fengqi (Huabei Oilfield Company) | Zhao, Xianzeng (Huabei Oilfield Company) | Sun, Yuefeng (Texas A&M University)
Abstract Fractures and fracture-related dissolution pores, as well as cavities, molds, and vugs, provide the major conduit and/or storage space for hydrocarbons in the deeply buried carbonate hill of Hexiwu field, Bohai Bay Basin. The fractured reservoir generally has lower porosity but better permeability than moldic/vuggy reservoir, and it consists of the major part of the buried-hill slope and buried-hill internal reservoirs. The conventional method of characterizing carbonate reservoirs, however, often mixes these two types of reservoirs together because they both have low acoustic impedance and low bulk modulus. The rock-physics analysis of two field wells indicates that a pore-structure parameter defined in a rock-physics model, the so-called Sun model, can help to distinguish the fractured reservoir zones together with porosity. Fractured zones usually have porosity of less than 5% and a pore-structure parameter of greater than six, whereas moldic/vuggy reservoirs of higher porosity have a pore-structure parameter of less than six. Field-scale application demonstrates that simultaneous prestack seismic inversion for the porosity and pore-structure parameter enables 3D mapping of fractured reservoir zones in the buried carbonate hills. It also provides an analog of detecting fractures and/or fracture-related pores in deeply buried carbonates in similar geologic settings.
- Asia > China (1.00)
- North America > United States > Texas > Dawson County (0.25)
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (1.00)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (24 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
Seismic exploration worldwide, particularly in China, has been shifting toward deeper and geologically more complex formations than before. Assessment of the occurrence and distribution of “sweet spots” or reservoir quality prediction is desirable even in the early stage of expensive deep explorations. Using a case study of deeply buried carbonate hills of Ordovician age and at a depth of around 6km in the Bohai Basin, we demonstrate that among the daunting challenges, accurate seismic imaging of geological structures, high-fidelity seismic amplitude preservation, high seismic resolution and ground-truth data available are the foremost in order to enable stratigraphic interpretation and reservoir property inversion. When and where these four criteria are met, post-stack seismic inversion can help map the fractured zones and potential high-porosity formations and pre-stack seismic inversion based on rock physics models can be applied to separate the fractured zones from the high-porosity reservoirs.
- Geology > Geological Subdiscipline > Stratigraphy (0.72)
- Geology > Geological Subdiscipline > Geomechanics (0.51)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.56)
- Asia > China > Xinjiang Uyghur Autonomous Region > Junggar Basin (0.99)
- Asia > China > Sichuan > Sichuan Basin > Puguang Field (0.99)
- Asia > China > Hebei > Bohai Basin > Huabei Field (0.99)
- Asia > China > Bohai Basin (0.99)