Application of horizontal development wells in reserves evaluation and development of offshore oilfields
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摘要:
海上油田开发初期由于钻井少, 资料录取有限, 且缺少动态资料, 油田储量认识存在较大不确定性, 随着开发程度的提高, 往往会出现储量与产量之间的矛盾, 而储量再评价是解决这种矛盾的重要方式。为提高开发效率, 缩减成本, 海上油田更多以水平井开发, 受井型的影响, 开发阶段资料录取往往受限, 因此新增水平井资料成为油田储量再评价中获得新的地质油藏认识以及提高储量估算精度的关键。为进一步获得可靠的储量评价结果, 解决油田的动静态矛盾, 笔者在分析珠江口盆地储量变化主控参数的基础上, 根据水平井钻井特征, 充分挖掘水平开发井在提高主控参数精度上的作用。分析结果显示含油面积和有效厚度在储量评估中的不确定性最大, 是引起储量变化的两个主控参数, 水平开发井在提升油田产能、确定有效厚度下限、微构造研究、岩性边界以及流体界面识别等方面具有较好的作用, 在资料录取有限的情况下, 利用水平开发井能有效提高主控参数精度, 获得相对合理的地质储量, 解决油田生产动态矛盾的同时, 也为油田后期挖潜指明方向。南海东部多个油田的应用实例也证实这一认识。
Abstract:In the early stage of offshore oilfield development, due to the lack of drilling, limited data admission, and lack of dynamic data, there is great uncertainty in the understanding of oilfield reserves. With increased degree of development, production is usually inconsistent with reserves, and reserve re-evaluation is an important way to resolve this problem. In order to improve the development efficiency and reduce costs, offshore oilfields are dominated by horizontal wells, resulted in limited data acquisition. Therefore, new horizontal well data has become the key to obtainnew geological reservoir parameters and improve the accuracy of reserve estimation. In order to further obtain reliable reserve evaluation results and resolve the dynamic and static contradictions of the oilfield, based on analyzing the main controlling parameters of reserve change in the Pearl River Mouth Basin, this study fully excavates the role of horizontal development wells in improving the accuracy of primary controlling parameters.Our results show that the oil-bearing area and effective thickness are the most uncertain in the reserve assessment, and cause the change of reserves. Horizontal development well is critical in improving the production capacity of the oilfield, determining the lower limit of effective thickness, investigating microstructure, and identifying lithological boundary and fluid interface, etc. In the case of limited data access, the utilizationof horizontal development wells can effectively improve the accuracy of major controlling parameters to obtain relatively reasonable geological reserves, and solve the dynamic contradictions of oilfield production. It also points out the direction for late exploration and development of oilfields. Application examples from multiple oil fields in the eastern South China Sea also confirm this understanding.
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图 1 南海东部砂岩油田各储量参数影响权重分布示意图
Figure 1. Distribution of influence weights of reserve parameters in sandstone oilfields in eastern South China Sea
图 2 B油田核算前测井解释界限图版(孔隙度和含水饱和度)
Figure 2. Limit chart of logging interpretation before accounting in B Oilfield(porosity VS water saturation)
图 4 B油田核算后测井解释界限图版(孔隙度和含水饱和度)
Figure 4. Limit chart of logging interpretation after accounting in B Oilfield(porosity VS water saturation)
图 5 C油田A9H井测井曲线图
LLS.浅电阻率; LLD.深电阻率; PIGN.孔隙度; 其他同图 3
Figure 5. Logging curve of A9H well in C Oilfield
图 7 H油田L油藏顶面构造与振幅属性叠合图
Figure 7. Superimposed map of top structure and amplitude attribute of L reservoir in H Oilfield
图 9 H3井水平段随钻测井曲线及反演地层剖面
Figure 9. LWD and inversion of stratigraphic profile for horizontal intervals in Well H3
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