Buried Reservoir Of Dacheng Area And Its Insider Exploration Targets And Implement Accumulation Evaluation

Carbonate (qianshan and buried inside) reservoir exploration, has been an important field of north China oilfield exploration, though once under the huabei oilfield key epochs as tertiary, but carbonate reservoirs in the exploration never gave up, after years of exploration, in carbonate rock reservoir exploration continued to have the new findings, and accumulated a certain amount of experience. Especially in Rao Yang and BaXian buried more than the number in, wide distribution, the oil reservoir type is rich, needed further exploration of the field wide, has great potential. Especially in qianshan insider reservoir study, exploration degree is relatively low, nearly two years in Rao Yang and BaXian sag have made significant breakthrough. Su49, Ma851, Xi20Wells and the ordovician Cambrian YouQiLiu won the high yield. Article3the well the Cambrian JunShan group’s high-yield, show Baxian sag buried buried deep inside the good reservoirs and exploration prospects. But qianshan insider accumulation conditions complex, trap found, implement and evaluate accumulation is difficult, and set up a special research topics of the research into the system, and realize the qianshan insider exploration new breakthrough.DaCheng convex of huabei oil field is a deep but small buried oil and gas enrichment exploration area, due to the buried hill hydrocarbon accumulation conditions are complex, traps found, implementation, evaluation of hydrocarbon accumulation is difficult; Large number of buried hills and widely distributed in Dacheng operation area, reservoir type of rich,and great potential.Using petroleum geology born, reservoir,lid, trap, movement and conserve theory of comprehensive security analysis and deepen the operation area by the3D structural interpretation of seismic data,classifying of DaCheng convex buried hill and researching of reservoir accumulation conditions, petroleum born reservoir, cap space combination is more reasonable to fault development,Carboniferous-Permian sandstone within the development, work area good source of oil supply conditions, there is a favorable oil migration channels with a certain cover conditions, generally determined large city raised a certain exploration potential, as the transformation of their break-up tectonic unit, named the class Ⅱ more favorable regions.From analyzing accumulation conditions, the reason is:a. It has two sets of oil source:for the first set of shahejie formation of lower oil source. DaCheng of the west side BaXian sag and raised Rao Yang sag is faulted reservoir of oil source existed in two of the biggest sag. Due to the west, pointed out Mesozoic, in this raised20part directly in shahejie formation covered permo-carboniferous, above the ordovician. Therefore, of shahejie formation of oil and gas can be directly into the permo-carboniferous and the ordovician. The second set for the permo-carboniferous oil source. The hydrocarbon source rocks in big1, only6lack area, other areas are covered. In the great city of convex northwest permo-carboniferous buried depth, have secondary hydrocarbon generation and evolution in mature stage. According to the northwest university LuoZhu gold calculation, cangxian uplift permo carboniferous gathered for the free gas for3.8trillion m3.According to the great city raised permo-carboniferous area analogy, the area of carboniferous-permian gathered for the free gas for1.5trillion m3; B. qianshan insider has four sets of reservoir:the first set of reservoir for the Permian stone feng group, stone box and on the stone box group. The reservoir in oilfield property good possibilities. In the great city of southwest and northwest raised by particle size coarsens, property have obvious change good trend. The second set of reservoir for the ordovician, the thing the gender is good. The third set for the Cambrian to house JunShan group is given priority to, the fourth set for the fog of the fans, for regional high quality reservoirs. C. exist inside the cover of four sets:the first set for the cover of Mesozoic, general thick300-500m, the thick of up to1100m. Among them the Jurassic lithology to dark mudstone, coal formation is given priority to, distribution in the northwestern convex, an area of about1000km2; C. The second set for the cover of carboniferous-permian. Among them the carboniferous taiyuan benxi group, and group of shanxi formation of Permian, thickness of400m or so, with mudstone lithology and coal-bearing strata is given priority to, covering the great city of97%raised area. The third and fourth set for the Cambrian XuZhuang-MaoZhuang-steamed bread group and the stimulation of the mouth is regional caprocks. D. preservation conditions to the northwest change good trends:big1, big six well drilling results, the ordovician covering the above the town formation, area of60km this open "skylight" missing inside cover layer, save condition is poor. But because of the lower end of Himalayan movement Ⅱ in the district is weak, the most areas save permo-carboniferous stratum, and raised in northwestern also retained the thick Mesozoic.Buried from reservoir water salinity analysis, northwest to bump a trend of increase. Dacheng convex of the tongue and double convex Panzhuang kiln raised reservoir water salinity general for2000mg/1or so, to the Dacheng convex raised for5000mg/1or so, again to the easy-possibilities area, can increase to10000-40000mg/1, CaCl2and water for MgCl2is saved in good condition. Dacheng convex, raised the west possibilities for transition in relationship, so Dacheng in western convex preservation conditions have gradually become the good trend.From the feature of structure, the earthquake data confirms, simple structure form, for west become warped east of the single out of the east, east have fault depression with the Tampa segmentation, west side slope with easy transition. Drilling data confirms the highest part of the east for the cover of ordovician in above. The west development Mesozoic strata, carboniferous-permian strata best-preserved, and cover most of the region. We according to the structure of the buried, namely the cover of buried and combination relations, divided into landscape (remnants the buried and buried inside type type two kinds and five and class:Landscape (remnants the buried type (including landform and physiognomy of buried high type low two and buried class), buried inside type (ancient born inside the world of ancient inside the class. under the ancient world, yuan inside three and class).In the structure interpretation, using a variety of methods for the seismic interpretation of workstation, such as horizon calibration, seismic reflection wave group characteristics and velocity analysis, reasonable structure and detailed explanation of the structure form description, buried inside Dacheng area and accumulation of exploration and evaluation, provides the basis.