利用岩石弹性模量定量评价潜山储层产能的方法

渤海油田潜山储层岩性复杂、孔隙结构复杂、非均质性强,导致测井响应特征复杂,而DST测试一般都是对潜山井段进行大段合试,因此潜山产出层段的划分缺乏可靠的依据。针对该难点,对基质孔隙和裂缝同时存在的双重孔隙介质Biot理论进行推导,并模拟双孔介质情况下岩石的弹性模量与裂缝孔隙度的关系,发现弹性模量随裂缝孔隙度的增大而减小,而裂缝孔隙度是影响潜山裂缝性储层产能的关键参数。因此,应用弹性模量进行潜山储层产能评价具有坚实的理论基础,进而建立弹性模量与产出剖面测井的关系,然后利用这一关系评价潜山储层的产能。文中提出的这种潜山储层产能评价的方法在渤海锦州南油田多口井潜山储层评价中取得了较好的应用效果,证实了该方法的有效性,同时也扩展了阵列声波测井的应用范围。

New quantitative calculation method for buried-hill reservoir productivity by rock mechanical parameters

Buried-hill reservoir of Bohai Oilfield has the characteristics of complex lithology,complex pore structure and strong anisotropy,which lead to the complex logging response characteristics.DST test is generally carried out for the entire buried-hill reservoir.Therefore,it is impossible to determine the output capacity of each interval.Aiming at the difficulty,based on the Biot theory of the double porosity media in buried-hill reservoir,the relationship between elastic modulus and fracture porosity was obtained.The results show elastic modulus decreases with the increase of fracture porosity.Fracture porosity is the key parameter affecting the productivity of fractured reservoirs,evaluation of buried-hill reservoir productivity by elastic modulus has a solid theoretical basis.Then the relationship between elastic modulus and productivity from production log is generated and used to estimate the production of buried-hill reservoir.The method proposed in this paper has achieved good application effect through actual application and the validity of this method is confirmed,which expands the scope of array acoustic logging.