Gas reservoir in Es

3

interval of Qiaokou structure is characterized by its great buried depth

long gas-bearing interval

poor physical property

great change longitudinally and transversally

low productivity of gas bearing strata and unstable pressure.It is believed

by analyzing structure of litho-composition

sedimentary facies belts

physical property

overburden

structure and hydrocarbon evolution

that sedimentary facies is the main factor among several controlling factors

gravitational flow channel sandbody and physical property of fan-braided channel in the sublacustrine fan is not good but also buried in mudstone of hydrocarbon genetic depression which is favorable for hydrocarbon trapping and accumulating to reservoir.Therefore

it is necessary to stress the importance of next step exploration by strengthening a carefully study of sedimentary facies

analyzing those favorable sedimentary facies by combining seismic data with data of well-logging

predicating reservoir.