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Northern South China Sea continental shelf in the compartments within the typical sag vertical distribution of oil and gas


Z21-】) boxes,[link widoczny dla zalogowanych], box green gas reservoir (15-1 Eastern Music beam 1-1) box (Music East 30 -] have been willing to see the air show) Box F (Cliff】 3-1 away gas) case by (See Ya Cao】 91,01-1 gas shows have been) tank pressure zone (see the thin oil layer has been) box on the pressure transition zone (gas Wenchang 9-2) box (see Wenchang 1o-l has been shown complain basin gas) (2) the distribution of gas reservoirs in the depth of focus with the following two and one exploration prospect with (Table 7); ① 3200 ~ 4000m depth concentration zone: 131 Cliff cliff sag large gas fields, Wenchang Wenchang A sag condensate 9-2 gas reservoir and Yingge Sea Basin, the East 30 music shows a gas trap I have distributed in this band, they are in deep under the top box area of the tank and gas reservoirs or deep inside the top box area of the tank external pressure transitional zone gas reservoir. ② 12 ∞ ~ 2600m depth of focus with: Yingge Sea Basin Ledong 15-1, 1-1 and benefits the East of Southwest and other low-lying, Huizhou 21-1 gas reservoir and a small number of Weixinan Au Ge condensate reservoirs are distributed in this top box with them and the relationship between the depth of the following 3 cases belonging to the top of the box by the shallow mud diapir vent into the container or box outside edge of the gas reservoir. b,[link widoczny dla zalogowanych], deep box on the top area of a mature and low-mature gas condensate reservoir (rich in condensate); c. Shallow box or box top area high maturity under the condensate reservoir. ⑧ 4000 ~ 5000m with the exploration vision; top boxes in the deep area inside the Wenchang A sag already see deep basin gas display; deep in the top 234 of China Offshore Oil and Gas (Geology) South Cliff area of depression. Has also been found inside the cliff 19-1,21 -1 gas show structure, and thus has certain exploration vision. 5 Conclusion (1) a typical northern South China Sea continental shelf, rich oil source (gas) storage tank widespread phenomenon of depression, but the compartment overpressure intensity,[link widoczny dla zalogowanych], depth and top of the main hydrocarbon source rock into the compartment with the time of the thermal maturity vary because of depression. Therefore, the compartment type of vertical distribution of oil and gas as an important control of geological factors. (2) In order to become oil-based depression, in case the roof is shallow, and the pressure inside the main anomalous zone and the main oil source rocks into oil with a depth consistent with the circumstances, oil and gas reservoirs on the roof, are distributed within the bottom and form a multi -line oil, but the main producing formation is often the main source rocks adjacent to the upper and lower distribution. Buried deep in the tank roof, and the pressure inside the main anomalous zone and the high oil source rock with a depth of a consistent over-mature cases, the reservoir above the main roof in the box next to cover or partially cover the regional distribution. (3) in the main gas source rocks in the high over-mature with a deep depression in the top box,[link widoczny dla zalogowanych], conventional gas reservoir in the box on the pressure transition zone or the normal pressure zone within the transition zone with a pressure seal on the gas reservoir conditions formation is particularly advantageous. Storage box is a deep basin gas accumulation in favorable sites (4) in the main gas source rocks and reservoir with the cap in the area under the excess pressure to form in the case of deep top compartment, the gas is distributed in the box or boxes under (about 3200m below). Among them, the box under the reservoir, \ (5) in the development of high-strength diapir overpressure basin, depth of ups and downs in sealed boxes. Diapir development in the area, shallow box top can be formed by the diapir in the box on the high pressure gas reservoir with a discharge or low-yield high-pressure gas tank at the edge of diapir not developed the top box area in the deep, more gas storage in the box; top boxes in the deep zone,[link widoczny dla zalogowanych], conventional gas distributed in boxes, especially in the pressure transition zone , while the box may be tight sandstone gas reservoirs in the main overpressure. (6) the formation of large gas reservoir, was to be a sufficient amount of free gas for gas transport gas source \ l 1A well drilled a half-closed and semi -deep shallow phase Meishan group) and high rate of trap formation of more favorable gas; and low abundance of source rocks (such as flow Yinggehai group and the group of yellow) and a low rate of accumulation may be beneficial to trap gas in water . practicing the above, the distribution of reservoir overpressure compartment strength and depth on the top surface, therefore, the type of compartment, in particular, the depth of top boxes, significant oil and gas exploration. This paper analysis based on the pressure conditions, the preliminary understanding, yet with eight of the deep geological conditions, to further improve the level of research. (Editor: Item-ray) References 1 Hao SS. compartment. China Offshore Oil and Gas (Geology), 1993, 【1) 612 Lee Long Cheng. Oil and gas migration. Beijing: Petroleum Industry Press, 19873 Walter H Vetter abnormal formation pressure. Songxiang Zhen translation. The second pull; Beijing Petroleum Industry Press .19854 are rocky, Qi thick hair. Dai Jinxing geology of natural gas shall perish. Beijing: Petroleum Industry Press, 1989 ■ ■
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