CN106837322A - Shale reservoir into seam Capability index acquisition methods and device - Google Patents
Shale reservoir into seam Capability index acquisition methods and device Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及页岩气储层技术领域，尤其涉及一种页岩储层成缝能力指数获取方法及装置。The invention relates to the technical field of shale gas reservoirs, in particular to a method and device for obtaining a shale reservoir fracture forming ability index.
背景技术Background technique
在页岩气储层技术领域，通常情况下，在水力压裂施工前，需要对页岩储层的成缝能力进行评价，但是，目前国内外还没有统一的评价标准和方法。In the field of shale gas reservoir technology, under normal circumstances, before hydraulic fracturing, it is necessary to evaluate the fracturing ability of shale reservoirs. However, there is no unified evaluation standard and method at home and abroad.
影响储层成缝能力的关键因素包括水平地应力差、页岩脆性和天然裂缝系的发育状态。现有技术中，在对页岩储层的成缝能力指数进行获取时，是将水平地应力差、页岩脆性和天然裂缝系的发育状态三个因素综合在一起，从而获得页岩储层的成缝能力评价指数。但是，在获取天然裂缝系的发育状态这一参数时，由于客观因素，使得获取到的天然裂缝系的发育状态的值不准确，从而导致获取到的页岩储层的成缝能力指数的准确性不高。The key factors affecting the fracturing ability of reservoirs include horizontal stress difference, shale brittleness and the development state of natural fracture systems. In the prior art, when obtaining the fracturing ability index of shale reservoirs, the three factors of horizontal stress difference, shale brittleness and the development state of natural fracture systems are combined together to obtain the shale reservoir seam forming ability evaluation index. However, when obtaining the parameter of the development state of the natural fracture system, due to objective factors, the obtained value of the development state of the natural fracture system is inaccurate, which leads to the accuracy of the obtained fracturing ability index of the shale reservoir. Sex is not high.
发明内容Contents of the invention
本发明提供一种页岩储层成缝能力获取方法及装置，以提高页岩储层的成缝能力指数的准确性。The invention provides a method and device for acquiring fracturing ability of shale reservoirs, so as to improve the accuracy of the fracturing ability index of shale reservoirs.
本发明实施例提供一种页岩储层成缝能力指数获取方法，包括：An embodiment of the present invention provides a method for obtaining a shale reservoir fracture forming ability index, including:
获取所述页岩储层的脆性指数和水平地应力差系数；Obtain the brittleness index and horizontal stress difference coefficient of the shale reservoir;
获取所述页岩储层的应力敏感性系数；Obtaining the stress sensitivity coefficient of the shale reservoir;
根据所述脆性指数、所述水平地应力差系数及所述应力敏感性系数确定所述页岩储层成缝能力指数。The shale reservoir fracturing ability index is determined according to the brittleness index, the horizontal in-situ stress difference coefficient and the stress sensitivity coefficient.
在本发明一实施例中，所述获取所述页岩储层的应力敏感性系数，包括：In an embodiment of the present invention, the acquiring the stress sensitivity coefficient of the shale reservoir includes:
获取所述页岩储层的轴向压力，并获取所述轴向压力下所述页岩储层的纵向波速；obtaining the axial pressure of the shale reservoir, and obtaining the longitudinal wave velocity of the shale reservoir under the axial pressure;
根据所述轴向压力和所述纵向波速，获取所述应用敏感性系数。The application sensitivity coefficient is obtained according to the axial pressure and the longitudinal wave velocity.
在本发明一实施例中，所述根据所述轴向压力和所述纵向波速，获取所述应用敏感性系数，包括：In an embodiment of the present invention, the acquisition of the application sensitivity coefficient according to the axial pressure and the longitudinal wave velocity includes:
根据所述轴向应力和所述纵向波速确定线性拟合系数；determining a linear fitting coefficient according to the axial stress and the longitudinal wave velocity;
根据所述线性拟合系数确定所述应力敏感性系数。The stress sensitivity coefficient is determined according to the linear fit coefficient.
在本发明一实施例中，所述根据所述轴向应力和所述纵向波速确定线性拟合系数，包括：In an embodiment of the present invention, the determining the linear fitting coefficient according to the axial stress and the longitudinal wave velocity includes:
根据Vp＝Ks·σA+C1确定线性拟合系数；Determine the linear fitting coefficient according to V p =K s ·σ A +C 1 ;
其中，Vp表示纵向波速，Ks表示线性拟合系数，σA表示轴向压力，C1表示第一常数。Among them, V p represents the longitudinal wave velocity, K s represents the linear fitting coefficient, σ A represents the axial pressure, and C 1 represents the first constant.
在本发明一实施例中，所述根据所述线性拟合系数确定所述波速应力敏感性系数，包括：In an embodiment of the present invention, the determination of the wave velocity stress sensitivity coefficient according to the linear fitting coefficient includes:
根据Ss＝Ks/C2确定所述应力敏感性系数；The stress sensitivity coefficient is determined according to S s =K s /C 2 ;
其中，Ss表示应力敏感性系数，Ks表示线性拟合系数，C2表示第二常数。Among them, S s represents the stress sensitivity coefficient, K s represents the linear fitting coefficient, and C 2 represents the second constant.
在本发明一实施例中，所述根据所述脆性指数、所述水平地应力差系数及所述应力敏感性系数确定所述页岩储层成缝能力指数，包括：In an embodiment of the present invention, the determination of the shale reservoir fracturing ability index according to the brittleness index, the horizontal in-situ stress difference coefficient and the stress sensitivity coefficient includes:
根据FI＝B+Ss+SD确定所述页岩储层成缝能力指数；Determine the fracturing ability index of the shale reservoir according to FI=B+S s +S D ;
其中，FI表示所述页岩储层成缝能力指数，B表示所述脆性指数，Ss表示应力敏感性系数，SD表示所述水平地应力差系数。Among them, FI represents the fracturing ability index of the shale reservoir, B represents the brittleness index, S s represents the stress sensitivity coefficient, and SD represents the horizontal in-situ stress difference coefficient.
在本发明一实施例中，所述获取所述页岩储层的脆性指数，包括：In an embodiment of the present invention, the obtaining the brittleness index of the shale reservoir includes:
根据所述B＝Cquartz/(Cquartz+Cclay+Ccarbonate)获取所述页岩储层的脆性指数；Obtain the brittleness index of the shale reservoir according to the B=C quartz /(C quartz +C clay +C carbonate );
其中，B表示所述脆性指数，Cquartz表示所述页岩储层的石英含量，Cclay表示所述页岩储层的黏土含量，Ccarbonate表示所述页岩储层的碳酸盐含量。Wherein, B represents the brittleness index, C quartz represents the quartz content of the shale reservoir, C clay represents the clay content of the shale reservoir, and C carbonate represents the carbonate content of the shale reservoir.
在本发明一实施例中，所述获取所述页岩储层的水平地应力差系数，包括：In an embodiment of the present invention, the acquisition of the horizontal in-situ stress difference coefficient of the shale reservoir includes:
根据SD＝1/(σH-σh)获取所述页岩储层的水平地应力差系数；Obtain the horizontal in-situ stress difference coefficient of the shale reservoir according to S D =1/(σ H -σ h );
其中，SD表示所述水平地应力差系数，σH表示所述页岩储层的水平地最大应力，σh表示所述页岩储层的水平地最小应力。Wherein, SD represents the horizontal stress difference coefficient, σ H represents the maximum horizontal stress of the shale reservoir, and σ h represents the minimum horizontal stress of the shale reservoir.
本发明实施例还提供一种页岩储层成缝能力指数获取装置，包括：The embodiment of the present invention also provides a shale reservoir fracturing capability index acquisition device, including:
获取模块，用于获取所述页岩储层的脆性指数和水平地应力差系数；以及获取所述页岩储层的应力敏感性系数；An acquisition module, configured to acquire the brittleness index and the horizontal stress difference coefficient of the shale reservoir; and acquire the stress sensitivity coefficient of the shale reservoir;
确定模块，用于根据所述脆性指数、所述水平地应力差系数及所述应力敏感性系数确定所述页岩储层成缝能力指数。A determining module, configured to determine the shale reservoir fracture forming ability index according to the brittleness index, the horizontal in-situ stress difference coefficient and the stress sensitivity coefficient.
在本发明一实施例中，所述获取模块，具体用于获取所述页岩储层的轴向压力，并获取所述轴向压力下所述页岩储层的纵向波速；根据所述轴向压力和所述纵向波速，获取所述应用敏感性系数。In an embodiment of the present invention, the acquiring module is specifically configured to acquire the axial pressure of the shale reservoir, and acquire the longitudinal wave velocity of the shale reservoir under the axial pressure; The applied sensitivity coefficient is obtained from the pressure and the longitudinal wave velocity.
在本发明一实施例中，所述获取模块，具体用于根据所述轴向应力和所述纵向波速确定线性拟合系数；根据所述线性拟合系数确定所述应力敏感性系数。In an embodiment of the present invention, the acquisition module is specifically configured to determine a linear fitting coefficient according to the axial stress and the longitudinal wave velocity; determine the stress sensitivity coefficient according to the linear fitting coefficient.
在本发明一实施例中，所述获取模块，具体用于根据Vp＝Ks·σA+C1确定线性拟合系数。In an embodiment of the present invention, the acquisition module is specifically configured to determine the linear fitting coefficient according to V p =K s ·σ A +C 1 .
其中，Vp表示纵向波速，Ks表示线性拟合系数，σA表示轴向压力，C1表示第一常数。Among them, V p represents the longitudinal wave velocity, K s represents the linear fitting coefficient, σ A represents the axial pressure, and C 1 represents the first constant.
在本发明一实施例中，所述获取模块，具体用于根据Ss＝Ks/C2确定所述应力敏感性系数。In an embodiment of the present invention, the acquisition module is specifically configured to determine the stress sensitivity coefficient according to S s =K s /C 2 .
其中，Ss表示应力敏感性系数，Ks表示线性拟合系数，C2表示第二常数。Among them, S s represents the stress sensitivity coefficient, K s represents the linear fitting coefficient, and C 2 represents the second constant.
在本发明一实施例中，所述确定模块，具体用于根据FI＝B+Ss+SD确定所述页岩储层成缝能力指数；In an embodiment of the present invention, the determination module is specifically used to determine the shale reservoir fracture forming ability index according to FI=B+ S s +SD;
其中，FI表示所述页岩储层成缝能力指数，B表示所述脆性指数，Ss表示应力敏感性系数，SD表示所述水平地应力差系数。Among them, FI represents the fracturing ability index of the shale reservoir, B represents the brittleness index, S s represents the stress sensitivity coefficient, and SD represents the horizontal in-situ stress difference coefficient.
在本发明一实施例中，所述获取模块，具体用于根据所述B＝Cquartz/(Cquartz+Cclay+Ccarbonate)获取所述页岩储层的脆性指数；In an embodiment of the present invention, the acquisition module is specifically used to acquire the brittleness index of the shale reservoir according to the B=C quartz /(C quartz +C clay +C carbonate );
其中，B表示所述脆性指数，Cquartz表示所述页岩储层的石英含量，Cclay表示所述页岩储层的黏土含量，Ccarbonate表示所述页岩储层的碳酸盐含量。Wherein, B represents the brittleness index, C quartz represents the quartz content of the shale reservoir, C clay represents the clay content of the shale reservoir, and C carbonate represents the carbonate content of the shale reservoir.
在本发明一实施例中，所述获取模块，具体用于根据SD＝1/(σH-σh)获取所述页岩储层的水平地应力差系数；In an embodiment of the present invention, the acquisition module is specifically used to acquire the horizontal in-situ stress difference coefficient of the shale reservoir according to S D =1/(σ H -σ h );
其中，SD表示所述水平地应力差系数，σH表示所述页岩储层的水平地最大应力，σh表示所述页岩储层的水平地最小应力。Wherein, SD represents the horizontal stress difference coefficient, σ H represents the maximum horizontal stress of the shale reservoir, and σ h represents the minimum horizontal stress of the shale reservoir.
本发明实施例提供的页岩储层成缝能力指数获取方法及装置，通过获取页岩储层的脆性指数和水平地应力差系数，并获取页岩储层的应力敏感性系数；再根据脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数。由此可见，本发明实施例提供的页岩储层成缝能力指数获取方法，是通过脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数三个参数确定的，从而提高了页岩储层的成缝能力指数的准确性，且可操作性强。The shale reservoir fracturing ability index acquisition method and device provided by the embodiments of the present invention obtain the brittleness index and the horizontal stress difference coefficient of the shale reservoir, and obtain the stress sensitivity coefficient of the shale reservoir; then according to the brittleness Index, horizontal in-situ stress difference coefficient and stress sensitivity coefficient determine the fracture forming ability index of shale reservoirs. It can be seen that the method for obtaining the shale reservoir fracturing ability index provided by the embodiment of the present invention is determined by determining the three parameters of the shale reservoir fracturing ability index through the brittleness index, the horizontal stress difference coefficient and the stress sensitivity coefficient Therefore, the accuracy of the fracturing ability index of shale reservoirs is improved, and the operability is strong.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图做一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1为本发明实施例提供的一种页岩储层成缝能力指数获取方法的流程示意图；Fig. 1 is a schematic flow chart of a method for obtaining a shale reservoir fracturing ability index provided by an embodiment of the present invention;
图2为本发明实施例提供的另一种页岩储层成缝能力指数获取方法的流程示意图；Fig. 2 is a schematic flowchart of another method for obtaining shale reservoir fracturing ability index provided by an embodiment of the present invention;
图3为本发明实施例提供的一种获取纵向波速的示意图；Fig. 3 is a schematic diagram of obtaining longitudinal wave velocity provided by an embodiment of the present invention;
图4为本发明实施例提供的一种获取应用敏感性系数的流程示意图；FIG. 4 is a schematic flow diagram of obtaining an application sensitivity coefficient provided by an embodiment of the present invention;
图5为本发明实施例提供的一种轴向应力与纵向波速之间的关系示意图；Fig. 5 is a schematic diagram of the relationship between axial stress and longitudinal wave velocity provided by an embodiment of the present invention;
图6为本发明实施例提供的一种页岩储层成缝能力指数获取装置60的结构示意图。Fig. 6 is a schematic structural diagram of a device 60 for acquiring a shale reservoir fracture forming ability index provided by an embodiment of the present invention.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例，例如能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein, for example, can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.
需要说明的是，下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例中不再赘述。It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.
图1为本发明实施例提供的一种页岩储层成缝能力指数获取方法的流程示意图，该页岩储层成缝能力指数获取方法可以由页岩储层成缝能力指数获取装置执行，示例的，该页岩储层成缝能力指数获取装置可以单独设置，也可以集成在处理器中。请参见图1所示，该页岩储层成缝能力指数获取方法可以包括：Fig. 1 is a schematic flow chart of a method for obtaining a shale reservoir fracturing ability index provided by an embodiment of the present invention, the method for obtaining a shale reservoir fracturing ability index can be executed by a shale reservoir fracturing ability index obtaining device, As an example, the device for obtaining the shale reservoir fracture forming ability index can be set separately, or can be integrated in the processor. Please refer to Fig. 1, the method for obtaining the fracturing ability index of shale reservoirs may include:
S101、获取页岩储层的脆性指数和水平地应力差系数。S101. Obtain the brittleness index and horizontal stress difference coefficient of the shale reservoir.
示例的，在本发明实施例中，可以先收集待测量的井底岩心，钻取Φ25*50mm的样品，再将钻样过程中的碎块粉碎为320目粉末，然后放入烘干室进行烘干，烘干室温度设为105摄氏度，烘干时间视岩样大小而定，再测试矿物成分，从而根据矿物成分确定页岩储层的脆性指数。当然，本发明实施例只是以320目和烘干室温度设为105摄氏度为例进行说明，但并不代表本发明仅局限于此。As an example, in the embodiment of the present invention, the bottom hole core to be measured can be collected first, a sample of Φ25*50mm is drilled, and then the fragments during the drilling process are crushed into 320 mesh powder, and then put into a drying room for For drying, the temperature of the drying chamber is set at 105 degrees Celsius, and the drying time depends on the size of the rock sample, and then the mineral composition is tested, so as to determine the brittleness index of the shale reservoir according to the mineral composition. Certainly, the embodiment of the present invention is only illustrated by taking the 320 mesh and the drying chamber temperature as 105 degrees Celsius as an example, but it does not mean that the present invention is limited thereto.
S102、获取页岩储层的应力敏感性系数。S102. Obtain a stress sensitivity coefficient of the shale reservoir.
其中，该应力敏感性系数是指岩石在应力作用下，天然裂隙闭合，以使波速增加的速率。Among them, the stress sensitivity coefficient refers to the rate at which the natural cracks of the rock are closed under the action of stress to increase the wave velocity.
需要说明的是，在本发明实施例中，S101和S102之间并无先后顺序，可以先执行S101，再执行S102，当然，也可以先执行S102，再执行S101，本发明实施例只是以先执行S101，再执行S102为例进行说明，但并不代表本发明仅局限于此。It should be noted that, in the embodiment of the present invention, there is no sequence between S101 and S102. S101 can be executed first, and then S102 can be executed. Of course, S102 can also be executed first, and then S101. Execute S101 and then execute S102 as an example for illustration, but it does not mean that the present invention is limited thereto.
S103、根据脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数。S103. Determine the fracturing capability index of the shale reservoir according to the brittleness index, the horizontal in-situ stress difference coefficient, and the stress sensitivity coefficient.
在分别获取到页岩储层的脆性指数、水平地应力差系数及应力敏感性系数之后，就可以根据这三个参数确定页岩储层成缝能力指数，从而对页岩储层成缝能力进行评价。After obtaining the brittleness index, horizontal in-situ stress difference coefficient and stress sensitivity coefficient of the shale reservoir respectively, the fracturing ability index of the shale reservoir can be determined according to these three parameters, so as to determine the fracturing ability of the shale reservoir. Make an evaluation.
本发明实施例提供的页岩储层成缝能力指数获取方法，通过获取页岩储层的脆性指数和水平地应力差系数，并获取页岩储层的应力敏感性系数；再根据脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数。由此可见，本发明实施例提供的页岩储层成缝能力指数获取方法，是通过脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数三个参数确定的，从而提高了页岩储层的成缝能力指数的准确性，且可操作性强。The method for obtaining the fracturing ability index of the shale reservoir provided by the embodiment of the present invention obtains the brittleness index and the horizontal stress difference coefficient of the shale reservoir, and obtains the stress sensitivity coefficient of the shale reservoir; then according to the brittleness index, The horizontal in-situ stress difference coefficient and stress sensitivity coefficient determine the fracture forming ability index of shale reservoirs. It can be seen that the method for obtaining the shale reservoir fracturing ability index provided by the embodiment of the present invention is determined by determining the three parameters of the shale reservoir fracturing ability index through the brittleness index, the horizontal stress difference coefficient and the stress sensitivity coefficient Therefore, the accuracy of the fracturing ability index of shale reservoirs is improved, and the operability is strong.
基于图1对应的实施例，在图1对应的实施例的基础上，进一步地，请参见图2所示，图2为本发明实施例提供的另一种页岩储层成缝能力指数获取方法的流程示意图，当然，本发明实施例只是以图2为例进行说明，但并不代表本发明仅局限于此。该页岩储层成缝能力指数获取方法可以包括：Based on the embodiment corresponding to Fig. 1, on the basis of the embodiment corresponding to Fig. 1, further, please refer to Fig. 2, Fig. 2 is another shale reservoir fracturing ability index acquisition provided by the embodiment of the present invention A schematic flow chart of the method, of course, the embodiment of the present invention is only illustrated by taking FIG. 2 as an example, but it does not mean that the present invention is limited thereto. The method for obtaining the shale reservoir fracture forming ability index may include:
S201、获取页岩储层的脆性指数和水平地应力差系数。S201. Obtain the brittleness index and the horizontal stress difference coefficient of the shale reservoir.
可选的，在本发明实施例中，在通过选取待测页岩样品，将其粉碎为320目粉末，再测试得到矿物成分之后，可以根据B＝Cquartz/(Cquartz+Cclay+Ccarbonate)获取页岩储层的脆性指数。Optionally, in the embodiment of the present invention, after selecting the shale sample to be tested, crushing it into a 320-mesh powder, and then testing to obtain the mineral composition, according to B=C quartz /(C quartz +C clay +C carbonate ) to obtain the brittleness index of shale reservoirs.
其中，B表示脆性指数，Cquartz表示页岩储层的石英含量，Cclay表示页岩储层的黏土含量，Ccarbonate表示页岩储层的碳酸盐含量。Among them, B represents the brittleness index, C quartz represents the quartz content of the shale reservoir, C clay represents the clay content of the shale reservoir, and C carbonate represents the carbonate content of the shale reservoir.
可选的，在本发明实施例中，可以通过查找相关资料，以确定页岩储层的水平地最大应力和最小应力，在水平地最大应力和最小应力确定之后，就可以根据SD＝1/(σH-σh)获取页岩储层的水平地应力差系数。Optionally, in the embodiment of the present invention, the horizontal maximum stress and the minimum stress of the shale reservoir can be determined by looking up relevant data. After the horizontal maximum stress and the minimum stress are determined, it can be calculated according to S D =1 /(σ H -σ h ) to obtain the horizontal stress difference coefficient of the shale reservoir.
其中，SD表示水平地应力差系数，σH表示页岩储层的水平地最大应力，σh表示页岩储层的水平地最小应力。Among them, S D represents the horizontal stress difference coefficient, σ H represents the maximum horizontal stress of the shale reservoir, and σ h represents the minimum horizontal stress of the shale reservoir.
S202、获取页岩储层的轴向压力，并获取轴向压力下页岩储层的纵向波速。S202. Obtain the axial pressure of the shale reservoir, and obtain the longitudinal wave velocity of the shale reservoir under the axial pressure.
示例的，请参见图3所示，图3为本发明实施例提供的一种获取纵向波速的示意图。在圆柱样30的一端301施加轴向压力，并通过波速传感器302检测轴向压力下页岩储层的纵向波速。For an example, please refer to FIG. 3 , which is a schematic diagram of obtaining longitudinal wave velocity provided by an embodiment of the present invention. Axial pressure is applied to one end 301 of the cylinder 30, and the longitudinal wave velocity of the shale reservoir under the axial pressure is detected by the wave velocity sensor 302.
在本发明实施例中，可以先钻取页岩，将钻取的页岩放在压机上，在轴向加压过程中测试轴向的纵向波速，在整个加压过程中，其轴向压力逐步增加至30MPa，且在逐步加压的过程中，可以每隔2MPa测试在该轴向压力下页岩储层的纵向波速，从而可以确定页岩储层的轴向压力及在该轴向压力下页岩储层的纵向波速。In the embodiment of the present invention, the shale can be drilled first, the drilled shale can be placed on the press, and the axial longitudinal wave velocity can be tested during the axial compression process. The pressure is gradually increased to 30MPa, and during the gradual pressurization process, the longitudinal wave velocity of the shale reservoir under this axial pressure can be tested every 2MPa, so that the axial pressure of the shale reservoir and the Longitudinal wave velocity in shale reservoirs under pressure.
需要说明的是，在本发明实施例中，只是以轴向压力逐步增加至30MPa为例进行说明，当然，也可以为20MPa至50MPa范围内任一值，在此，本发明不做具体限制。此外，在确定纵向波速时，本发明实施例只是以每隔2MPa测试在该轴向压力下页岩储层的纵向波速为例进行说明，当然，也可以为1MPa或者3MPa，具体可以根据实际需要进行设置，在此，本发明不做进一步地限制。It should be noted that in the embodiment of the present invention, the axial pressure is gradually increased to 30MPa as an example for illustration. Of course, it can also be any value within the range of 20MPa to 50MPa, and the present invention does not make specific limitations here. In addition, when determining the longitudinal wave velocity, the embodiment of the present invention is just an example of measuring the longitudinal wave velocity of the shale reservoir under the axial pressure every 2MPa. Of course, it can also be 1MPa or 3MPa, which can be determined according to actual needs. It is set, here, the present invention is not further limited.
S203、根据轴向压力和纵向波速，获取应用敏感性系数。S203. Obtain an application sensitivity coefficient according to the axial pressure and the longitudinal wave velocity.
其中，该应力敏感性系数是指岩石在应力作用下，天然裂隙闭合，以使波速增加的速率。Among them, the stress sensitivity coefficient refers to the rate at which the natural cracks of the rock are closed under the action of stress to increase the wave velocity.
在获取到轴向压力和纵向波速之后，就可以根据该轴向压力和纵向波速确定应用敏感性系数。After obtaining the axial pressure and longitudinal wave velocity, the application sensitivity coefficient can be determined according to the axial pressure and longitudinal wave velocity.
S204、根据脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数。S204. Determine the fracturing capability index of the shale reservoir according to the brittleness index, the horizontal in-situ stress difference coefficient, and the stress sensitivity coefficient.
可选的，在分别获取到脆性指数、水平地应力差系数及应力敏感性系数之后，就可以根据FI＝B+Ss+SD确定页岩储层成缝能力指数。Optionally, after obtaining the brittleness index, the horizontal in-situ stress difference coefficient and the stress sensitivity coefficient respectively, the shale reservoir fracture forming ability index can be determined according to FI= B +S s +SD.
其中，FI表示页岩储层成缝能力指数，B表示脆性指数，Ss表示应力敏感性系数，SD表示水平地应力差系数。Among them, FI represents the fracturing ability index of shale reservoirs, B represents the brittleness index, S s represents the stress sensitivity coefficient, and SD represents the horizontal stress difference coefficient.
由此可见，本发明实施例提供的页岩储层成缝能力指数获取方法，是通过脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数三个参数确定的，从而提高了页岩储层的成缝能力指数的准确性，且可操作性强。It can be seen that the method for obtaining the shale reservoir fracturing ability index provided by the embodiment of the present invention is determined by determining the three parameters of the shale reservoir fracturing ability index through the brittleness index, the horizontal stress difference coefficient and the stress sensitivity coefficient Therefore, the accuracy of the fracturing ability index of shale reservoirs is improved, and the operability is strong.
进一步地，在本发明实施例中，S203根据轴向压力和纵向波速，获取应用敏感性系数可以通过以下可能的方式实现，请参见图4所示，图4为本发明实施例提供的一种获取应用敏感性系数的流程示意图。Further, in the embodiment of the present invention, S203 obtains the application sensitivity coefficient according to the axial pressure and the longitudinal wave velocity in the following possible ways, please refer to Fig. 4, which is a kind of Schematic diagram of the process for obtaining applied sensitivity coefficients.
S401、根据轴向应力和纵向波速确定线性拟合系数。S401. Determine a linear fitting coefficient according to the axial stress and the longitudinal wave velocity.
可选的，请参见图5所示，图5为本发明实施例提供的一种轴向应力与纵向波速之间的关系示意图。在获取到轴向应力和纵向波速之后，就可以根据Vp＝Ks·σA+C1确定线性拟合系数。Optionally, please refer to FIG. 5 , which is a schematic diagram of the relationship between axial stress and longitudinal wave velocity provided by an embodiment of the present invention. After obtaining the axial stress and the longitudinal wave velocity, the linear fitting coefficient can be determined according to V p =K s ·σ A +C 1 .
其中，Vp表示纵向波速，Ks表示线性拟合系数，σA表示轴向压力，C1表示第一常数。Among them, V p represents the longitudinal wave velocity, K s represents the linear fitting coefficient, σ A represents the axial pressure, and C 1 represents the first constant.
S402、根据线性拟合系数确定应力敏感性系数。S402. Determine the stress sensitivity coefficient according to the linear fitting coefficient.
可选的，在通过S301获取到线性拟合系数之后，就可以根据Ss＝Ks/C2确定应力敏感性系数。Optionally, after the linear fitting coefficient is obtained through S301, the stress sensitivity coefficient can be determined according to S s =K s /C 2 .
其中，Ss表示应力敏感性系数，Ks表示线性拟合系数，C2表示第二常数。Among them, S s represents the stress sensitivity coefficient, K s represents the linear fitting coefficient, and C 2 represents the second constant.
示例的，在本发明实施例中，C2的值为50，即可以根据Ss＝Ks/50确定应力敏感性系数，当然，本发明实施例只是以C2的值为50为例进行说明，具体可以根据实际需要进行设置，在此，本发明不做进一步地限制。Illustratively, in the embodiment of the present invention, the value of C 2 is 50, that is, the stress sensitivity coefficient can be determined according to S s =K s /50, of course, the embodiment of the present invention only takes the value of C 2 as 50 as an example Note that it can be specifically set according to actual needs, and the present invention does not make further limitations here.
图6为本发明实施例提供的一种页岩储层成缝能力指数获取装置60的结构示意图，当然，本发明实施例只是以图6为例进行说明，但并不代表本发明仅局限于此。请参见图6所示，该页岩储层成缝能力指数获取装置60可以包括：Fig. 6 is a schematic structural diagram of a shale reservoir fracturing capability index acquisition device 60 provided by an embodiment of the present invention. Of course, the embodiment of the present invention is only illustrated by taking Fig. 6 as an example, but it does not mean that the present invention is limited to this. Please refer to Fig. 6, the device 60 for acquiring the shale reservoir fracture forming ability index may include:
获取模块601，用于获取页岩储层的脆性指数和水平地应力差系数以及获取页岩储层的应力敏感性系数。The obtaining module 601 is used to obtain the brittleness index and the horizontal stress difference coefficient of the shale reservoir and the stress sensitivity coefficient of the shale reservoir.
确定模块602，用于根据脆性指数、水平地应力差系数及应力敏感性系数确定页岩储层成缝能力指数。The determination module 602 is used to determine the fracturing ability index of the shale reservoir according to the brittleness index, the horizontal ground stress difference coefficient and the stress sensitivity coefficient.
可选的，获取模块601，具体用于获取页岩储层的轴向压力，并获取轴向压力下页岩储层的纵向波速；根据轴向压力和纵向波速，获取应用敏感性系数。Optionally, the acquiring module 601 is specifically configured to acquire the axial pressure of the shale reservoir, and acquire the longitudinal wave velocity of the shale reservoir under the axial pressure; and acquire the application sensitivity coefficient according to the axial pressure and the longitudinal wave velocity.
可选的，获取模块601，具体用于根据轴向应力和纵向波速确定线性拟合系数；根据线性拟合系数确定应力敏感性系数。Optionally, the obtaining module 601 is specifically configured to determine a linear fitting coefficient according to the axial stress and the longitudinal wave velocity; and determine a stress sensitivity coefficient according to the linear fitting coefficient.
可选的，获取模块601，具体用于根据Vp＝Ks·σA+C1确定线性拟合系数。Optionally, the obtaining module 601 is specifically configured to determine the linear fitting coefficient according to V p =K s ·σ A +C 1 .
其中，Vp表示纵向波速，Ks表示线性拟合系数，σA表示轴向压力，C1表示第一常数。Among them, V p represents the longitudinal wave velocity, K s represents the linear fitting coefficient, σ A represents the axial pressure, and C 1 represents the first constant.
可选的，获取模块601，具体用于根据Ss＝Ks/C2确定应力敏感性系数。Optionally, the obtaining module 601 is specifically configured to determine the stress sensitivity coefficient according to S s =K s /C 2 .
其中，Ss表示应力敏感性系数，Ks表示线性拟合系数，C2表示第二常数。Among them, S s represents the stress sensitivity coefficient, K s represents the linear fitting coefficient, and C 2 represents the second constant.
可选的，确定模块602，具体用于根据FI＝B+Ss+SD确定页岩储层成缝能力指数。Optionally, the determining module 602 is specifically configured to determine the shale reservoir fracture forming ability index according to FI=B+ S s +SD.
其中，FI表示页岩储层成缝能力指数，B表示脆性指数，Ss表示应力敏感性系数，SD表示水平地应力差系数。Among them, FI represents the fracturing ability index of shale reservoirs, B represents the brittleness index, S s represents the stress sensitivity coefficient, and SD represents the horizontal stress difference coefficient.
可选的，获取模块601，具体用于根据B＝Cquartz/(Cquartz+Cclay+Ccarbonate)获取页岩储层的脆性指数。Optionally, the acquiring module 601 is specifically configured to acquire the brittleness index of the shale reservoir according to B=C quartz /(C quartz +C clay +C carbonate ).
其中，B表示脆性指数，Cquartz表示页岩储层的石英含量，Cclay表示页岩储层的黏土含量，Ccarbonate表示页岩储层的碳酸盐含量。Among them, B represents the brittleness index, C quartz represents the quartz content of the shale reservoir, C clay represents the clay content of the shale reservoir, and C carbonate represents the carbonate content of the shale reservoir.
可选的，获取模块601，具体用于根据SD＝1/(σH-σh)获取页岩储层的水平地应力差系数。Optionally, the acquiring module 601 is specifically configured to acquire the horizontal in-situ stress difference coefficient of the shale reservoir according to S D =1/(σ H −σ h ).
其中，SD表示水平地应力差系数，σH表示页岩储层的水平地最大应力，σh表示页岩储层的水平地最小应力。Among them, S D represents the horizontal stress difference coefficient, σ H represents the maximum horizontal stress of the shale reservoir, and σ h represents the minimum horizontal stress of the shale reservoir.
本发明实施例所示的页岩储层成缝能力指数获取装置60，可以执行上述方法实施例所示的技术方案，其实现原理以及有益效果类似，此处不再进行赘述。The shale reservoir fracturing capability index acquisition device 60 shown in the embodiment of the present invention can implement the technical solution shown in the above method embodiment, and its implementation principle and beneficial effect are similar, and will not be repeated here.
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.
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