缝洞型碳酸盐岩油藏水驱曲线特征——以塔河油田奥陶系油藏为例

Water drive curves of fractured-vuggy carbonate rock reservoirs——taking the Ordovician carbonate reservoirs in Tahe oilfield as an example

陈青 易小燕 闫长辉 王旭

Chen Qing Yi Xiaoyan Yan Changhui Wang Xu

水驱曲线法在我国已广泛地应用了多年,无论是理论还是实践一般仅限于砂岩油藏,而碳酸盐岩油藏水驱特征比砂岩油藏更复杂,多变。以塔河油田奥陶系碳酸盐岩油藏为例,通过水驱曲线的形态,归纳水驱曲线具有3种类型:单一直线段、两直线段(呈台阶状),不规则的水驱曲线。其中,台阶状反映了碳酸盐岩油藏具有缝洞发育、水体能量不稳定、水驱规律复杂的特征,并具有能量下降波及不同水体。通过典型井的水分析资料,验证了同一个缝洞单元内存在多个水体供给能量。

Although widely applied in China for years,the application of water drive curve method has been ge-nerally limited to the study of sandstone reservoirs both in theory and practice.This time,however,it is used in the study of the Ordovician carbonate reservoirs in the Tahe Oilfield.The water drive performance of carbonate reservoirs is much more complicated and changeable than that of sandstone reservoirs.Three types of curves are observed in the study of these reservoirs,including regular curve with single linear portion,regular curve with two linear portions(step-like curve),and irregular curve.Among them,the second one reflects such features of these reservoirs as well-developed fracture and vugs,unstable water body energy,and complicated water-driving pattern.It also indicates that the decline of energy affects different water bodies.An analysis of water from a typical well verifies the existence of several water bodies in one fractured-vuggy unit.

10.11743/ogg20100105