The middle sandbody of underwater alluvial fan , the front sandbody of fan delta . the fracture developed belts , and the ancient weathering crust are beneficial exploration area of J3-K1 strata in Northeastern oil-gas basins.
Well TZ162 is an exploration well with high H2S content in Tarim exploration area,in case that the H2S content was up to 37500 ppm, the well was opened to flow for 81 hours, test and measurement were completely successful.
Neopalaeozoic formation of Fuxian Exploration Area in Shanbei was low porosity and permeability and tight. Major reservoir pore spaces in Down-Palaeozoic were emposieus with 1～3 mm by diameter and fractures with 0.2~7.0 mm by width which were main accumulation areas of oil and gas.
The structural characteristics of the foothill belt have been basically known, some piedmont depressions and overthrust nappe zones have been discovered, and the exploration area of Qaidam Basin has been widened as well on the basis of the application of the integrated geophysical and geochemical exploration techniques.
and it is thought that the south part of Taihang piedmont fault depression belt has good prospects for exploring for polygenic natural gas because of high geothermal gradients beneficial to the transform of the hydrocarbon source rocks in Carboniferous Permian coal measures,of providing mantle source gas at the eastern foot of Taihangshan Mountains and of a wide spread exploration area.
Some problems and their brief analyses are presented facing some current issues of general interest,including theories about the formation of high-altitude reservoirs,development and challenges of non-marine petroleum geology,types of potential reservoir and exploration area(stratigraphic-lithological traps),and attributes of natural gas formation and distribution.
The effective exploration area is 5.63×10~4km~2 with the total resource volume being 10000×10~8m~3. This paper focuses on Quaternary natural gas exploration history, current biological gas resources volume, biological gas exploration potential analysis and biological gas exploration target, stressing that rich resource conditions, enormous exploration area and low exploration degree hold the key to success of Quaternary biological gas exploration.
On the basis of the conclusion made on Well Moushen logging evaluation, combined with seismic datum process, comprehensive oil geology evaluation about this area was made. As a result, exploration area increased 1000km~2, oil resource volume was forecasted to 1.2×10~8t, and 8 favorable structures were proposed.
Jixi Basin,located in the east of Heilongjiang Province, has a natural gas show in 1985,but only about half of the basin is effective exploration area,where hydrocarbon kitchens are partially destroyed,geological conditions are complex and exploration risk is high.
East China Sea shelf basin, with an effective exploration area of 240,000km 2 and a maximum sediment thickness over 15km, is the biggest Meso_Cenozoic basin offshore China. There are rich petroleum resources in the basin, but their development is still in a beginning stage due to immature exploration.