To solve the prevention and control of hydrogen sulfide in the well block area, a comprehensive analysis was conducted using core samples, drilling data, logging data, well testing data, and seismic data. The quantile classification method was employed to assess the risk levels of hydrogen sulfide wells in the Bonan Sag. Using a 1:2:4:2:1 hundred-digit classification method, the study area was divided into five levels of hydrogen sulfide environmental zones, and the high-risk sulfur-containing area in the Bonan Sag was identified. Vertically, the concentration of hydrogen sulfide gradually increases with terrain from low to high. Horizontally, the source of hydrogen sulfide in the carbonate rocks of the upper Sha 4th member exhibits characteristics of “rich gypsum, rich limestone, hydrocarbon generation, and high pressure”, representing a typical “self-generated” type of hydrogen sulfide. The sag and slope areas lack material supply, but carbonate rocks are widely distributed. The coexistence of gypsum and limestone in the southern slope zone provides reservoir space for hydrogen sulfide, while fault development creates conditions for its migration, and high-pressure sealing ensures its preservation. Medium-low risk areas are distributed between high-risk and medium-high risk zones. 

为解决井块区域硫化氢的防治问题, 综合分析岩芯、钻井、测录井、试油试井及地震资料, 采用分位数分级法, 对渤南洼陷的硫化氢井进行危险性等级评价。采用1:2:4:2:1的百位数分级法, 将研究区划分为5个等级的硫化氢环境域, 并确定渤南洼陷的高风险含硫区。纵向上, 硫化氢浓度随地形自低向高逐渐增加; 横向上, 沙四段的碳酸盐岩硫化氢来源具有“富膏、富灰、生烃、高压”的特点, 属于典型的“自力更生”型硫化氢。洼陷及斜坡带缺乏物源供给, 碳酸盐岩广泛分布, 南部斜坡带膏岩与灰岩的共存为硫化氢提供储集空间, 断层为硫化氢的运移创造条件, 高压封存为硫化氢的保存提供保障。中低风险区域分布在高风险区域与中高风险区域之间。