Yingjishu depression is located in the Easter of Tarim and exploration area amount to 15 X 104km2.

Diagenetic evolution mode and formation mechanism of the gas reservoir in Yingjisu Sag;

A two-stage mode of stable carbon isotopic profile of n-alkanes from crude oil in the Yingjisu sag of Tarim basin has been revealed, featuring a two-phase hydrocarbon accumulation process to date in this region.

Fluid history of Jurassic gas reservoir in Yingjisu sag is reconstructed and studied through testing hydrocarbon inclusions in reservoir rocks.

Through the studying of the structure background,source rocks,reservoirs and seals and preservation in the Yingjisu Sag in the east of Tarim Basin,the geologic conditions and main control factors of the accumulation are discussed.

The Yingjisu Sag, situated in northeastern Tarim Basin, was a part of the Central Asia-NW China superlarge Basin in Jurassic, and a cratonic basin (intracontinental depression) formed in Early Jurassic.

Yingjisu depression is a break-sinking basin that was developed on the low-Paleozoic denudation physiognomy.

Yingjisu depression lies in north of the Tarim basin as same as Kuche depression,they have the same deposit-tectonic evolution history.

The Meso-Cenozoic Yingjisu depression is a piggyback foreland ba si n developed in the setting of the Paleozoic thrust nappe structure.

There were three stages for forming Yingjisu depression, namely the early stage of bending, gaping, faulting, the middle stage of compression transformation and the late stage of stable overlying, and the geological configuration of the depression as a foreland basin was threefold.