白马庙气田蓬莱镇组多层气藏开发地质特征研究

STUDY ON DEVELOPMENT GEOLOGIC CHARACTERISTICS OF PENGLAIZHEN FORMATION MULTILAYER GAS RESERVOIR IN BAIMAMIAO GAS FIELD

白马庙气田蓬莱镇组多层气藏投入试生产以来 ,生产井总体表现出产能低 ,递减快 ,井筒积液现象较为严重 ,连续生产能力较弱等特征 ,对气藏开发造成了较大的困难。研究表明 :构造平缓 ,断层及裂缝不发育 ,单个砂体规模小 ,纵横向上不连续 ,砂体连通性较差是造成该气藏开发效果较差的主要因素。提出高效开发该气藏 ,应在砂体发育程度较高 ,构造变形作用较强 ,砂体储渗性能得到一定程度改善 ,压力系数较高 ,地层能量较为充足的构造轴部和南东翼鼻突布署开发井 。

Since the Penglaizhen Formation multiplayer gas reservoir in Baimamiao gas field put into trial production, the producing wells have overall displayed such characteristics as lower productivity, fast decline, more serious liquid cumulation at well bore, and weaker continuous production capacity etc. making gas reservoir harder develop. It is shown by research that the main factors that make gas reservoir have a worse development result are gentle structure, fault and fracture not growing, small scale for individual sand body, discontinuous both horizontally and longitudinally, and worse for sand body interconnection. It is put forward that, for efficiently developing this gas reservoir, the development wells should be disposed on the structure axial portion, and nose protrusion at east and south limbs where sand body is more growing, structural deformation is stronger, a definite improvement has been obtained for sand body storage and permeation, pressure coefficient is higher, and the formation energy is more sufficient; and multiplayer joint exploitation is adopted to enhance single well productivity and development result of gas reservoir.