Well hua 49 area in Huachi oil field, Xuanma area, well 63 area, well 55 area in Chenghua region in Shan-gan-ning basin are now produced under natural water drive.

陕甘宁盆地城华地区的华池油田华49井区、城壕油田玄马区、城63井区与城55井区目前均采用自然能量开采。

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Major sedimentary facies in the Huanhe-Huachi Formation include lacustrine facies, delta facies, meandering fluvial facies, and interbedded eolian sandstone facies.

而在环河华池组主要沉积了湖相、三角洲相、曲流河相及风成砂岩夹层。

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