Abstract：The natural gas exploration in Xujiaweizi fault depression of east fault depression area,deep Songliao basin has fulfilled development by leaps and bounds: the important discovery was achieved in Xushen No.1 well and above 1011m~3 of prospected reserve was provided.The Gulong-Changling fault depression in west fault depression area,as important natural gas reserve area in deep of Songliao basin,has similar properties as Xujianweizi fault depression in formation,structure and deposition.The area that the thickness of hydrocarbon source rock in Gulong-Changling fault depression is above 1000m is 10692 km~2,among which the thickest source rock reaches to 1400m and total reserve is 9425×10~8m~3.As a strategic follow-up area,the Gulong-Changling fault depression area has broad exploration prospect.On September 25,2005,46×10~4 m~3 per day of natural gas was obtained in Yingcheng Formation volcanic rock from Changshen No.1 well,resistance-free flow is above million cu m.The important breakthrough in Changshen No.1 well and success of exploration in Xujiaweizi of Songbei formed bright scenario in both north and south and revealed giant potential of natural gas exploration in deep of Songlia basin.
