太原组灰岩储层是以方解石、白云石为主的碳酸盐岩储层，具有非均质性强、孔-缝描述不准、杨氏模量高、储层应力差小等特征，储层改造过程中常出现液体滤失量较大、造缝困难、采收率低于预期等问题。为解决上述问题，通过研究酸化改造工艺与参数，开展酸压条件下力学参数测试，酸压加砂复合与多岩性组合下裂缝扩展规律、酸蚀裂缝加砂支撑导流研究，明确复合改造增产机理，优化地层改造方案。结果表明，以五年累产量计，HCl酸含量的增加，裂缝导流能力增强；随砂量增大产量增加；40~70目∶70~140目支撑剂比例在1∶2与2∶1产量达到最大值；随着滑溜水黏度增大，裂缝导流能力逐渐增强，在15~25 mPa·s产量取得最大值。以TE井为例，改造参数优选为泵注参数单相酸为100 m³，陶粒（35+1.1）m³，砂比为12.5%，排量为3.0~6.0 m³/min，前置液280 m³，携砂液280 m³，前置液比例为50.0%，可见复合改造裂缝导流能力明显提升，为灰岩储层经济高效开发，提高采收率奠定基础。

The Taiyuan Formation limestone reservoir is a carbonate reservoir mainly composed of calcite and dolomite, characterized by strong heterogeneity, inaccurate pore fracture description, high Young's modulus, and small reservoir stress difference. During the reservoir transformation process, problems such as large liquid filtration loss, difficult fracture formation, and lower than expected recovery rate often occur. To solve the above problems, by studying the acidification transformation process and parameters, conducting mechanical parameter testing under acid pressure conditions, studying the crack propagation law under acid pressure and sand composite and multi lithology combination, and conducting research on acid etched crack and sand support diversion, the mechanism of composite transformation production increase was clarified, and the formation transformation plan was optimized. The results indicate that, based on the cumulative production over five years, an increase in HCl acid content enhances the fracture conductivity; Production increases with the increase of sand volume; The maximum yield is achieved when the proppant ratio between 1: 2 and 2: 1 is between 40 ~ 70 mesh and 70 ~140 mesh; As the viscosity of the slippery water increases, the crack conductivity gradually increases, and the maximum production value is achieved between 15 ~ 25 mPa·s. Taking the TE well as an example, the optimal parameters for the transformation are pump injection parameters of single-phase acid 100 m³, ceramic particle (35 + 1.1) m³, sand ratio 12.5%, displacement 3.0 ~ 6.0 m³/min, pre fluid 280 m³, carrying sand fluid 280 m³, and pre fluid ratio 50.0%. After composite transformation, the fracture diversion capacity is significantly improved, laying the foundation for the economic and efficient development of limestone reservoirs and improving recovery rates.