Progradational sequence and retrograding sequence both ca.

It is found that the passage systems of different sequences have difference:(1) The passage systems of deep depositional sequences(Ek-Es4)are characterized by the complex hydrocarbon conduction in the sides of sandbodies.

These Cambrian strata have been grouped, on the basis of sedimentary facies sequences and stacking patterns of depositional sequences, into 63 third order sequences, or 22 second order megasequences and 4 first order supersequences, of which the latest ones represent the depositional cycles with the periods of 200-400 Ma during 1800.

Based on the theory of continental foreland basin combining with petroleum exploration practices,Basijiqike formation reservoir of Cretaceous in Kuqa foreland basin controled by continental depositional sequence has been studied.

Hydrocarbon evaluation analysis is based on different level research, such as basin analysis, sedimentary sequence analysis, and petroleum system analysis.

An investigation of sequence stratigraphy shows the Jurassic system in Kuqa Depression of Tarin basin can be divided into 8 sedimentary sequences, of which type I sequence boundary dominates.

By means of the research method of sedimentary geology, it is studied in detail on the petrologic characteristics, sedimentary sequences and distribution of the coal bearing strata below seam No 15, Taiyuan Formation in the Wuda Mine District, Neimenggu Autonomous Region, China.