Guizhou is representative of those provinces in southern China where oil and gas reservoirs related to Palaeozoic marine carbonates might take place.Prospecting work for oil and gas has been carried out for 28 Nears since 1956.To summarize achievements obtained in these years

the author has analized both positive and negative conditions for oil prospecting.In view of geotectonic and paleogeographic conditions

Guizhou Province obviously has better struc-tural traps

and good source rocks which should be quite productive and could provide great amount of petroleum.However

it has also some negative factors

such as strong crustal disturbance

uplifting and folding occurred in the later stage of geological history

and resulting in sebsequent intensive erosion and extra exposure of target formations

besides of aged source rocks and extraor-dinary maturity of organic substance as well as poor time conjunction of oil generation with formation of structural traps.Therefore

discovery of commer-cial oil reservoirs could hardly be expected;however

it is still prospective to find some gas fields.While analizing experiences obtained in searchingfor oil and gas

the author suggested that:1)plans should be worked out based on the petroleum geology of the target area proper

and no experiences introduced from abroad could be used stiffly;2)local experience should be used only in combination with the regional ones

pay more attention to fundamental geological wo

no need to be eager for success

and do not treat the complicated problem of petroleum geology in an isolated and one-sided attitude;3)grass-roots unit of geological administration should be established according to the natural geological unit

neither to have its functioning at the limitation of province and such political boundary nor operating changefully;4)different specialities should work jointly with their techniques being continually renewed.Finally

the author has made some recommendations about plans of explora-tion task from now on.