THE DISTRIBUTION OF STRATA AND OIL-GAS IN JURASSIC FORMATIONS OF JIAOPING MINING AREA, SHAANXI PROVINCE

There are some close relations between strata and oil distributions in Jiaoping coal bearing series. The major oil and gas shows were in the sand strata above and/or below the high-thickness coal areas. There are 4 such areas in the mining area. The oil and gas distribution in the coal bearing series could be further related to the thickness of Yanan formation (major coal bearing formation), sandrock of Yanan & Zhilou (over the Yanan) formations, all overlay formations of the coal bearing series, and to the rank of the organic matter. Structure form in the area is only secondary influence element of the distribution.