这篇文章由原地质矿产部第二综合物探大队陈关芬撰写于1978年，旨在探索井中重力测量在铬铁矿（尤其是盲矿体）勘探中的应用。文章首先基于球体模型的正演计算，分析了不同储量和距离下井中重力异常（Δg）及重力位二次微商（Vzz）的理论曲线，进而评估仪器精度需求，指出现有±10微伽级仪器配合100米网度可探测二十万吨级以上矿体，但对小规模矿体需加密测网。其次，推导了球体、水平圆柱体、任意倾角板状体及含钻孔水平层等规则体的正演公式，并计算典型理论曲线。结论表明单孔无法判断矿体方位，需多孔联合勘测。该文为早期井中重力方法应用提供了理论依据，对指导铬铁矿勘探具有参考价值。
This 1978 paper by Chen Guanfen explores the application of borehole gravity measurements in prospecting for chromite ore bodies (especially blind orebodies). Based on forward modeling of spherical bodies, the study analyzes theoretical curves of borehole gravity anomalies (Δg) and vertical gravity gradients (Vzz) for different orebody sizes and distances from the borehole. It evaluates instrument precision requirements, concluding that existing ±10 μGal instruments with 100×100 m grids can detect orebodies above 200,000 tons, while smaller deposits require denser surveys. Forward formulas are derived for spheres, horizontal cylinders, arbitrarily inclined plates, and horizontal layers with borehole effects. A key finding is that single boreholes cannot determine the azimuth of off-hole orebodies, necessitating multiple-hole surveys. The work provides theoretical foundations for borehole gravity method applications in chromite exploration.