Putaohua reservoir is delta-front facies sedimentary sand with not only high porosity and high permeability reservoirs but also shale-bearing,calcium-bearing and thin interbed reservoirs.

• 葡西地区葡萄花油层为三角洲前缘相沉积砂体 ,既有岩性纯、孔渗好的储层 ,又有含泥、含钙、薄互层的储层。