The Lower member of  the Shahejie Formation in the Wangxuzhuang Oilfield of the Huanghua Depression is 40-50m thick and mainly consists of carbonate rocks and shales. It is a carbonate-clastic intermixed platform in a lake. Carbonate rocks are mainly limestones, which can be further divided into sparry grainstones, limemud grainstones and limemud limestones. The grains are mainly gastropods as well as some ooids and intraclasts. Based on sedimentary characteristics, the platform can be divided into sparry grainstone bank, limemud grainstone bank and interbank. Sparry grainstone bank is persistently agitated high-energy environments, water depth is above the normal wave base, and the deposits are mainly sparry grainstones. Limemud grainstone bank is intermittently agitated environments, water depth is around the normal wave base, and the deposits are mainly limemud grainstones. Interbank is quiet low energy environments, water depth is below the normal wave base, and the deposits are mainly limemud limestones and shales. Both limemud grainstone bank and sparry grainstone bank mainly occurat the edge of the platform. The activity of contemporaneous fault controls the formation of platform and the distribution of banks. Sedimentary facies control the distribution of oil and gas. Sparry grainstone bank is the best reservoiring facies for oil and gas, limemud grainstone bank is the second, and the interbank can not form good reservoirs. High productivity wells are not located at the structural highs where interbank facies occur, but are located  at structural lows where there are sparry grainstone banks.