轮南古隆起控油理论及其潜山准层状油气藏勘探

Petroleum controlling theory of Lunnan paleohigh and its buried hill pool exploration technology,Tarim Basin

针对塔里木盆地轮南古隆起奥陶系潜山油气勘探的难点,应用新的学科理论和技术方法,系统研究轮南古隆起对奥陶系潜山油气聚集成藏的控制作用,建立轮南古隆起控油、潜山整体含油局部富集的理论体系。古隆起是油气长期运移的指向区,古隆起控制岩溶缝洞型储集体发育、输导体系的形成和潜山油气的多期成藏。提出轮南古隆起奥陶系风化壳岩溶型准层状油气藏新模式,认为受风化壳岩溶储集体的控制,油气富集在潜山表层150m深度范围内。同时,形成了该类油气藏勘探开发配套技术,如高精度三维地震储集体预测及酸压储集体改造技术、非均质碳酸盐岩油气藏井点优选及不规则井网开发技术等。

Aimed at the difficulties in the petroleum exploration and development, the controlling function of Lunnan paleohigh on the hydrocarbon accumulation of Ordovician buried hill is studied based on new theories and technologies. A theoretical system is established of the paleohigh controlling petroleum accumulation and the buried hill being wholly petroliferous with local enrichment. The paleohigh is the main direction that the hydrocarbon migrated to. It controls the up growth of karst crack-cavity type reservoir, the formation of the fault transportation system and the multiperiod accumulation of oil and gas. The paper presents a new model of karst quasi-layered reservoir of Lunnan residual paleohigh, indicating that the hydrocarbon under the control of karst reservoir is accumulated within the 150m of the surface layer of buried hill. A series of exploration and development technologies for buried hill pools of the kind are also developed, including the reservoir 3D seismic forecast and acidizing ~ fracturing improvement, the heterogeneous carbonate well point choice, and the irregular well pattern development, etc.