Abstract: TheWanchang Formation and Qijia Formation in Liangjia shallow reservoirs of Chaluhe fault have always been concurrent exploration horizon. As evaluation and deployment was intensified unceasingly, a series of hydrocarbon reservoirs with shallow depth and good benefit were discovered successively. In the past two years, overall study and deployment was carried out on Liangjia shallow reservoirs. Hydrocarbon reservoirs here were mainly controlled by faults and lithology, based on comprehensive analysis of the correlation of the structure, sediments, and reservoirs and the hydrocarbon accumulation in the studied area. It was confirmed that the first member of Wanchang Formation featured in co-production of oil and gas, simply oil production, simply gas production, and thorough development in whole area, while the first member of Qijia Formation was dominated by oil where oil and gas were mainly distributed in Block Xing 19-3. The first member of Qijia Formation was confirmed as a benefit block that could be developed and produced recently. This was of instructive significance to deployment of overall development and productivity construction in the block.

Key words: Yitong Basin, Liangjia shallow reservoir, hydrocarbon accumulation mechanism, hydrocarbon distribution law