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The Qiongdongnan basin tectonodynamics evolution and hydrocarbon accumulation research

Author: LiXuXuan
Tutor: XiaBin
School: Guangzhou Institute of Geochemistry
Course: Structural Geology
Keywords: Qiongdongnan Basin Regional geological evolution Basin structure Lithospheric extension The single break rifting with Double rift with Temperature and Pressure Fields Petroleum system Hydrodynamic system Hydrocarbon migration Conduit system Accumulation mode Exploration zone Exploration targets
CLC: P618.130.2
Type: PhD thesis
Year: 2004
Downloads: 1367
Quote: 10
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Abstract

The Qiongdongnan basin development in the Cenozoic sedimentary basins of the South China Sea continental shelf in the northwest area of ??about 30,000 km2. In the regional geological structure, the basin is located in the Pacific tectonic the tectonic transformation zone with Tethyan domain Eocene - early Oligocene experienced during the clockwise rotation of the Indochina extrusion strongly influenced rifting stage late getting Pliocene - Middle Miocene rift rifts transformation process, under the control of the South China Sea seafloor spreading during an active rifting and mantle activities related to the late Miocene. By the above regional geological evolution control basin formed on the longitudinal structural features off on Au rift structure and style, including a half-grabens and grabens are two ways in plane developmental north-south zonation and things points structural characteristics of the segment. Can accommodate different periods of space and balance of sediment supply, basin early Tertiary has gone through the Eocene terrestrial lacustrine the Yacheng the paralic environments and Lingshui group split shallow marine environment three sedimentary filling evolutionary stage ; late Tertiary mainly by crack subsidence and sea-level change is strongly influenced experienced Sanya - Meishan open shallow water filling stage and warbler yellow group to Quaternary open shallow water - the bathyal filling phase. The Qiongdongnan basin rifting of the lithosphere thermal state directly restricts the upper crustal extension way northern Depression with a single off the main half-graben structure rifting with stretch cracking occurs in the environment of a relatively cold lithosphere, and central depression with the formation of the the duplex rift half grabens and grabens with stretch cracking occurs in the environment of a relatively hot lithosphere. Basin temperature and pressure in today's field is mainly formed in the late active rifting events controlled by the early rift structure, performance with a high temperature and pressure characteristics duplex crack trapping single off rifting with is the normal temperature and pressure. The rift between the band the Yacheng - Songtao uplift belonged to the transition zone of the temperature and pressure, single well pressure curve the \structure. By the developmental characteristics and limitations of the basin sedimentary structure of hydrocarbon source rocks, Qiongdongnan basin development on petroleum systems in the next two sets, during cross between the early Miocene sedimentary sequence and collusion. Oil and gas mainly from the petroleum system. By Lower Tertiary structure - the structure of the sediment control basin northern Depression with various depressions and central depression belt Ledong, Lingshui and Taiwan, depression development with the main source rocks for oil generation capacity, other depression and low uplift The district developed mainly angry type main source rocks. Nowadays, organic matter thermal evolution of the northern depression zone oil generation mainly central depression with various depression angry. Resource evaluation, the prolific hydrocarbon depression the cliffs south, of Lingshui, Songnan and Taiwan Depression. Regional cap and jointly controlled temperature and pressure field characteristics of a the Qiongdongnan basin hydrodynamic system development and evolution. The mature primary migration mainly microfissure. Northern depression zone developed mainly lower energy compaction flow of petroleum secondary migration driven by the buoyancy and hydrodynamic migration to the slopes with advantage; central depression zone development has a higher temperature and pressure of the energy flow, oil and gas times by the pressure gradient transition zone to the relatively low pressure of the pressure control from overpressure zone and atmospheric pressure with vertical and lateral migration migration. Lateral secondary hydrocarbon migration pathway system including slope with unconformity - the lithology conduit system and spinal paleostructure, ramp Lee rift offset area development structure - lithology pathway system, which fan Delta relative to the high porosity and permeability sandstone a good transporting layer of oil and gas lateral migration. Lower Tertiary off from the same fault lateral transporting capacity, and large breaking distance with strong lateral sealing capacity of faults and reverse faults. The lower part of the open nature of the active faults in the Late Ming by deep undercompaction overpressure pelite development significantly affect regional development in the overpressure system undercompaction does not open strong. The lateral migration poly Qiongdongnan basin migration and accumulation mode, the fault activity areas exist in the peak period of hydrocarbon generation and expulsion development along the fault zone vertical migration and accumulation mode, and the presence of strong overpressure zone caprock Collapsible migration and accumulation mode. Basin Eastern District of mantle-derived non-hydrocarbon gas migration and accumulation mode, there are two different types of causes. Petroleum systems and reservoir systems are obvious basin geological evolution control, including large and medium-sized gas reservoir formation, the key geological conditions include: 1) today still has a rich supply of hydrocarbon source; 2) late tectonic activity conducive to hydrocarbon migration and accumulation accumulation; 3) gentle slope-type fan delta sand body high temperature and pressure depression oil and gas lateral migration \exploration zone. Qiongdongnan Basin can be divided with 16 natural gas exploration area, which, under the structural layer 9, the structural layer 7. Petroleum geological characteristics of the district with the the basin exploration geological risk factors including hydrocarbon source not drill depression risk, coZ risks, reservoir risk, risk of the abnormal overpressure risk deepwater exploration risk. 5; think on Tertiary traps with favorably to the secondary queuing order: One fracture aggregation with the Taiwan North aggregation with a fifth fracture accumulation zone with a second fracture gathered, Lower Tertiary traps with favorably to the times queuing order of : the No.1 fault gathered with a second fracture East gathered with a second fracture West gathered with a III fracture gathered with a Taiwan North gathered to Lingshui with a low arch gathered with. Absorption analytical techniques in the introduction and application of Metalink MDI comprehensive multi-attribute analysis technology, the elastic wave inversion technique and Geoview AVO inversion technique for the evaluation on the basis of the key exploration target, preferably breaking gathering with Yacheng, 1 26 3, Yacheng 26 a 2 Yacheng 19 and a bunch of goals, II fault zone eastern section gathered with Taiwan 19 a ZN (Taiwan 20 1), II fault zone, the western part of the accumulation zone of Lingshui 1 3, Tomb 3 structure and III fracture gathered with the downthrown side Yacheng 15 2 7 goals as the preferred target of the recent natural gas exploration.

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