CN111980687A - Method for identifying and comparing stratum by using element comparison relationship - Google Patents
Method for identifying and comparing stratum by using element comparison relationship Download PDFInfo
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- CN111980687A CN111980687A CN202010900564.6A CN202010900564A CN111980687A CN 111980687 A CN111980687 A CN 111980687A CN 202010900564 A CN202010900564 A CN 202010900564A CN 111980687 A CN111980687 A CN 111980687A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a method for identifying and comparing stratums by using element comparison relationship, which collects element logging data of adjacent wells in a well and calculates the relative content of each element logging; establishing an element stability index curve of an adjacent well; acquiring element logging data of a well through element logging work of the well, calculating an element stability index of the well, summarizing and concluding morphological characteristics and quantitative characteristic summarization of the element stability index of the well; comparing the element stability index morphological characteristics and the quantitative characteristics of the drilled well and the adjacent well to identify a drilling position of the drilled well; and judging the drilling situation of drilling through the target layer of the well drilling to form a description of the stratum layer of the drilling meeting. The invention utilizes data in the element logging technology to carry out data fitting, forms a method for carrying out stratum identification and comparison by utilizing element comparison relation, and is mainly used for field exploration and development of oil and gas fields.
Description
Technical Field
The invention relates to a method for carrying out data fitting by utilizing data in an element logging technology to form stratum identification and comparison by utilizing an element comparison relation, which is mainly used for field exploration and development of oil and gas fields and belongs to the field of application of logging-while-drilling data processing technology in the exploration and development category of petroleum and natural gas industry.
Background
At present, a drilling process is developed rapidly, great influence is caused to the logging industry, accurate lithology identification cannot be carried out according to fine powder rock debris, the difficult problem of rock debris identification is solved to a certain extent by applying an element logging technology, and meanwhile field stratum division work is facilitated. However, due to the application of the element logging technology, data analysis only stays in single data or content change of several data to determine the physicochemical properties of the rock, and accurate division of stratum sequences, especially fine comparison division of different oil groups, cannot be performed through the change of element content.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for identifying and comparing stratums by using element comparison relations, which identifies and divides the stratums and oil groups by using element stability indexes to guide field drilling construction, overcomes the problem that the stratum identification and division are carried out by using an element logging technology according to single data or a plurality of data, avoids the multi-solution property of the application of element logging data, improves the drilling time efficiency, and effectively improves the timeliness and effectiveness of the decision-making in the drilling process.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for identifying and comparing stratums by using element comparison relations comprises the following steps:
step 4, comparing the element stability index morphological characteristics and the quantization characteristics of the drilling well and the adjacent well to identify a drilling position of the drilling well, and comparing the element stability index morphological characteristics and the quantization characteristics of the drilling well at different depths to determine the drilling fault, the drilling interlayer and the drilling fault on the well track of the drilling well;
and 5, determining the characteristics of the stratum to be drilled and encountered in the well drilling, including fault, stratum repetition and stratum loss characteristics, and judging the drilling-through drilling condition of the target layer of the well drilling to form a stratum layer specification to be drilled and encountered.
The element logging data includes: ca element, Mg element, Si element, Fe element, Al element, Mn element and Ti element.
The endogenous mineral indicator elements in the step 2 are Ca and Mg; the mineral injection indicating elements are Si, Fe, Al, Mn and Ti.
The element stability index ═ (A + B)/(C + D + E + F + G)
Wherein, A-the relative content of Ca element (%) -measured in element log
B-relative content of Mg element (%) -measured by element logging
C-Al element relative content (%) -measured by element logging
D-relative content of Fe element (%) -measured by element logging
E-relative content of Si element (%) -measured in elemental logs
F-relative content of Ti element (%) -measured in element log
G-relative content (%) of Mn element determined by elemental logging.
The element stability index morphological characteristics refer to the linear type, the sawtooth shape, the box shape, the step shape and the sharp knife shape of the element stability index curve morphology, the quantitative characteristics refer to the high and low characteristics of the relative content contrast value of endogenous minerals and index elements of injected minerals in the deposition process, the injected minerals are more, the endogenous minerals are less, the relative instability is defined, the injected minerals are less, the endogenous minerals are more, the relative stability is defined, and the quantitative characteristics are used and defined as the extreme instability, wherein the element stability index is less than or equal to 0.2; the element stability index is more than 0.2 and less than or equal to 0.5; the stability is more than 0.5 and the element stability index.
In the step 4, the element stability indexes of the drilled well and the adjacent well are presented on a logging map by linear scales, and the drilled horizon and the characteristics are determined by comparing morphological characteristics.
In the step 4, the same layer is found in the drilling, the morphological characteristics of the element stability index are repeated in a retrograde mode, the quantitative characteristic contrast of the drilling in the same two layers is less than 1%, and the contrast formula is as follows: (S1 x 2-S1 x 2)/(S1+ S1 x 100%), wherein S1-average value of stability index of formation elements encountered during drilling for the first time, and S1-average value of stability index of formation elements encountered during drilling for the second time; the lower indication means that the lower part of a target layer is drilled, the drill meets a new stratum, the morphological characteristics of the element stability index have mutation, the quantitative characteristic comparison is more than or equal to 1 percent, and the comparison formula is as follows: (Sm x 2-Sms x 2)/(Sm + Sms) x 100%, wherein Sm-average value of element stability index 10-20m before drilling through a target layer and Sm-average value of element stability index when drilling in a new formation; in a fault, the morphological characteristics of element stability indexes are mutated, the quantitative characteristic comparison is more than or equal to 1 percent, and the comparison formula is as follows: (SsX 2-SxX 2)/(Ss + Sx) x 100%, wherein the average value of the Ss-element stability index before drilling through a target layer is 10-20m, the average value of the Sx-element stability index when drilling meets a new stratum is obtained, a well track enters a descending disc from an ascending disc, the stratum is lost, the morphological characteristics of the element stability index have no repeated rule, and the element stability index is mutated at a breakpoint and enters the ascending disc from the descending disc, the element stability index is mutated at the breakpoint, and the forward repeated characteristics of the drilled stratum and the upper drilled stratum appear; in the interlayer, the morphological characteristics of the element stability index have mutation, the quantitative characteristic contrast is more than or equal to 1 percent, and the contrast formula is as follows: (Sjq X2-Sj X2)/(Sjq + Sj). times.100%, after the well track is drilled through the interlayer, returning to the target layer, and comparing the quantitative characteristics of the element stability index with the drilled target layer by less than 1%, wherein the comparison formula is as follows: (Sjq X2-Sjh X2)/(Sjq + Sjh) X100%, wherein Sjq is the average value of element stability index of 10-20m before drilling into interlayer; sj-average value of element stability index of diamond encountering interlayer, and Sjh-average value of element stability index of 10-20m after diamond encountering interlayer.
In the step 5, the fault refers to morphological characteristic forward repetition or quantitative characteristic mutation characteristic, the stratum repetition refers to morphological characteristic reverse repetition characteristic, the stratum deletion refers to quantitative characteristic mutation characteristic, and a stratum division result is formed through a logging graph and an explanation.
The invention has the beneficial effects that: a method for identifying and comparing the stratum is added, so that the fine stratum description of the Buddhist is favorably developed and explored in the oil and gas field; the stratum identification efficiency in the drilling process is improved, the non-commission footage of the drilling is reduced, and the construction problems that the target layer is not drilled through and the like are avoided; effectively guide the adjustment of well-grinding track and improve the drilling rate of the reservoir.
Drawings
FIG. 1 is a diagram of an embodiment of an element stability index in drilling horizon identification according to the present invention.
FIG. 2 is a graph of an embodiment of the element stability index of the present invention with respect to formation duplication.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
The invention discloses a method index for identifying and comparing stratums by using element comparison relationship, which comprises the following specific steps:
and 2, establishing an element stability index curve of an adjacent well, and summarizing the morphological characteristics (linear type, sawtooth shape, box type, step type and sharp knife type) and quantitative characteristics (extremely unstable is less than or equal to 0.2, unstable is more than 0.2 and less than or equal to 0.5, and stable is more than 0.5) of the element stability index.
And 3, acquiring element logging data (Ca, Mg, Al, Fe, Si, Ti and Mn) in the well drilling through the element logging work in the well drilling, calculating the element stability index in the well drilling, summarizing and summarizing morphological characteristics (linear type, zigzag type, box type, step type and sharp knife type) and quantitative characteristics (extremely unstable is less than or equal to 0.2, unstable is more than 0.2 and less than or equal to 0.5, and stable is more than 0.5) of the element stability index in the well drilling.
Step 4, comparing element stability index morphological characteristics (linear type, saw tooth type, box type, step type and sharp knife type) and quantitative characteristics (extreme instability is less than or equal to 0.2, instability is more than or equal to 0.2 and less than or equal to 0.5 and stability is more than 0.5) of a drilled well and an adjacent well, identifying a drilling position of the drilled well, and determining a well track (upper appearance: morphological characteristics reverse repetition, lower appearance: quantitative characteristics mutation, fault: quantitative characteristics mutation and interlayer: quantitative characteristics mutation) of the drilled well (horizontal well) by comparing the element stability index morphological characteristics (linear type, saw tooth type, box type, step type and sharp knife type) and the quantitative characteristics (extreme instability is less than or equal to 0.2, instability is less than or equal to 0.5 and 0.5 is less than stability) of the drilled well (horizontal well) at different depths;
and 5, determining the characteristics of the stratum to be drilled and encountered during drilling, wherein the characteristics comprise fault (morphological characteristic forward repetition or quantitative characteristic mutation), stratum repetition (morphological characteristic reverse repetition) and stratum deletion (quantitative characteristic mutation), and judging the drilling and encountering condition of drilling through the target layer of the drilling well to form a stratum layer specification to be drilled and encountered.
In the step 1, the main work is to collect the element logging data of the adjacent well, and the element logging data comprises: ca element, Mg element, Si element, Fe element, Al element, Mn element and Ti element.
In the step 2, the collected adjacent well element logging data are mainly processed to form an element stability curve, the shape summary is carried out, the curve happiness characteristics (linear type, zigzag type, box type, step type and sharp knife type) of each interval are determined, the intervals of the intervals are divided according to the shape characteristics, and the average value of the element stability index is calculated to be used as the quantization characteristic of the interval. The calculation formula of the element stability index is as follows: the element stability index is (a + B)/(C + D + E + F + G).
A-the relative content (%) of Ca element determined by element logging;
b-the relative content (%) of Mg element determined by element logging;
c-the relative content (%) of Al element measured by element logging;
d is the relative content (%) of Fe element determined by element logging;
e-relative content (%) of Si element determined by elemental logging;
f-relative content (%) of Ti element determined by element logging;
g-relative content (%) of Mn element determined by element logging;
in the step 3, the collected logging information of the drilling elements is mainly processed to form an element stability curve, the shape summary is carried out, the curve auspicious characteristics (linear type, zigzag type, box type, step type and sharp knife type) of each layer section are determined, the layer section division is carried out according to the shape characteristics, and the average value of the element stability index is calculated to be used as the quantization characteristic of the layer section.
In the step 4, the main work is according to two parts of different well types: 1. and (3) according to the work of the step (3), displaying element stability indexes of the drilled well and the adjacent well on a log by linear scales, comparing the form characteristics to determine the drilled horizon and the characteristics, and comparing the form characteristics (linear type, saw tooth shape, box shape, step shape and sharp knife shape) of the element stability indexes of the drilled well and the adjacent well with the quantization characteristics (extremely unstable is less than or equal to 0.2, unstable is more than 0.2 and less than or equal to 0.5, and stable is more than 0.5) to identify the drilled horizon of the drilled well. 3. The type of the horizontal well, namely the stratum before the horizontal well enters the window, is the same as that of a vertical well, an inclined well and a large-displacement well by a contrast method. In the aspect of stratum identification of the horizontal section, the element stability index morphological characteristics and the quantitative characteristics of the drilled stratum and the drilled stratum are compared to determine the drilling meeting position of the drilling well track. The layer comparison result is divided into an upper outlet, a lower outlet, a drilling fault and a drilling interlayer. (1) The upward-out of the drill indicates that the drill meets the same position, the morphological characteristics of the element stability index show retrograde repetition, the quantized characteristic contrast of the drill meets the same position is less than 1 percent, and the contrast formula is as follows: (S1 x 2-S1 x 2)/(S1+ S1 x 100%). (S1-average value of first time drilling formation element stability index; S1^ -average value of repeated drilling formation element stability index). (2) The lower layer is drilled from the lower part of the target layer, when the drill meets a new stratum, the element stability index morphological characteristics have mutation, the quantitative characteristic contrast is more than or equal to 1 percent, and the contrast formula is as follows: (Sm x 2-Sms x 2)/(Sm + Sms) x 100%, wherein Sm-average value of element stability index 10-20m before drilling through a target layer and Sm-average value of element stability index when drilling in a new formation; (3) when the drilling fault occurs, the morphological characteristics of the element stability index have mutation, the quantitative characteristic contrast is more than or equal to 1 percent, and the contrast formula is as follows: (SsX 2-SxX 2)/(Ss + Sx) x 100%, the well track enters the descending disc from the ascending disc, the stratum is lost, the element stability index morphological characteristics have no repeated rules, and the element stability index morphological characteristics are suddenly changed at the break point, the element stability index is suddenly changed at the break point from the descending disc, and the drilled stratum and the upper drilled stratum have forward repeated characteristics (wherein Ss-average value of element stability index 10-20m before drilling through the target stratum, Sx-average value of element stability index when drilling through the new stratum). (4) When the diamond meets the interlayer, the morphological characteristics of the element stability index have mutation, the quantitative characteristic contrast is more than or equal to 1 percent, and the contrast formula is as follows: (Sjq X2-Sj X2)/(Sjq + Sj). times.100%, after the well track is drilled through the interlayer, returning to the target layer, and comparing the quantitative characteristics of the element stability index with the drilled target layer by less than 1%, wherein the comparison formula is as follows: (Sjq X2-Sjh X2)/(Sjq + Sjh) X100%, wherein Sjq is the average value of element stability index of 10-20m before drilling into interlayer; sj-average value of element stability index of diamond encountering interlayer, and Sjh-average value of element stability index of 10-20m after diamond encountering interlayer.
In the step 5, the method mainly works to determine the characteristics of the stratum to be met during drilling, including fault (morphological characteristic forward repeat or quantitative characteristic mutation), stratum repeat (morphological characteristic reverse repeat) and stratum loss (quantitative characteristic mutation) characteristics, and judge the drilling-through drilling condition of the target layer of the drilling well to form a result description of the stratum to be met.
The implementation mode of the invention depends on field logging construction, collects the logging data of the elements of the adjacent well and the well drilling, fits the stable index of the elements, compares the well types, forms stratum understanding and guides the field construction, and the specific case is as follows:
example 1
A method index for identifying and comparing stratums by using element comparison relations comprises the following specific steps:
GS 8 well 3816-4070m element logging data is collected through the steps.
And 2, establishing an element stability index curve of GD8, and summarizing morphological characteristics and quantitative characteristics of the element stability index according to the model to form a bottom layer hierarchy and characteristic summary.
By this step, it can be derived: GD8 well 3816-3890m is in a sawtooth-shaped rising shape in the form of element stability index from the well depth, the bottom is in a small blade shape, the well section is determined as S1, S1 is divided into four small layers S1-1 to S1-4, the curve of the S1-1 layer (3816-3830m) is in a sawtooth shape with smaller amplitude, the quantization characteristic is 0.2857, the curve of the S1-2 layer (3830-3854m) is in a sawtooth shape with smaller amplitude, the quantization characteristic is 0.2947, the curve of the S1-3 layer (3854-3870m) is in a sawtooth shape, the quantization characteristic is 0.3745, the curve of the S1-4 layer (3870-3891m) is in a step shape, the bottom is in a small blade shape, and the quantization characteristic is 0.4952.
The GD8 well 3881-3891m element stability index curve is in a linear type, the environment section is determined to be S2-5, and the quantitative characteristic is 0.2083.
The GD8 well 3891-3922m curve is in a sawtooth shape and has a small blade-shaped local part, and the well section is divided into S3-6 to S3-8. The upper part of the S3-6 layer (3891-3903m) is in a small blade shape, the lower part is in a sawtooth shape, the quantization characteristic is 0.2848, the S3-7 layer is in a relatively straight sawtooth shape, and the quantization characteristic is 0.2284. The S3-8 layer (3903-.
by this step, it can be derived: GD7-3-5H well 3090-3300 m is in sawtooth-shaped rising shape from well depth element stability index shape, bottom is in small blade shape, this well section is determined as S1, continue to say that S1 is divided into four small layers S1-1 to S1-4, S1-1 layer (3090-.
The GD7-3-5H well 3300-3330m element stability index curve is linear, and the environment segment is determined as S2-5, and the quantitative characteristic is 0.2059.
The GD7-3-5 well 3330-4502m curve is zigzag and has a local small blade-shaped feature, and the well section is divided into S3-6 to S3-8. The S3-6 layer (3330-. The S3-8 layer (4484-4502m) is jagged in the middle, quantifying feature 0.2318.
Step 4, comparing the element stability index morphological characteristics and the quantitative characteristics of the GD7-3-5H well and the GD8 to determine a drilling horizon, guiding the well to enter a window, and determining that drilling is finished;
through the steps, in the actual drilling process, the depth of the well is 3330m, the upper part shape of the well is consistent with that of an adjacent well GD8, and the window entering point of the target layer is determined. In the actual drilling process, the element stability index morphological characteristics and the quantitative characteristics are compared, so that the element stability index morphologies of a well GD7-3-5H well and a well GD8 are consistent, the quantitative characteristics of S1-2 to S3-7 layers are different by 0.0564 at most and 0.0012 at least, and the quantitative difference is mainly caused by instrument errors, the inclination angle of a stratum encountered by drilling and horizontal displacement. GD8 well S1-1 layer is underdeveloped, GD7-3-5 well S3-8 layer is drilled through, no matter taking part in contrast.
And 5, determining the characteristics of the stratum to be drilled and encountered of the GD7-3-5H, including the characteristics of faults, stratum loss, a mark layer and the like, judging the drilling and crossing conditions of the drilling and encountering at the target layer of the drilled well, and forming the layer position specification of the stratum to be drilled and encountered.
Through the work of the steps, the following steps can be obtained: the GD8 well was stratigraphically compared to the GD7-3-5H well drilled using the elemental stability index. However, the 3030-3090m of the GD7-3-5H well developed a set of mudstone, which was missing in the GD8 well because the Cantonese region developed faults at the bottom of the first section of the hole, missing part of the strata at the bottom of the first section of the hole and at the top of the second section of the hole.
The S1 layer of the well GD7-3-5H and GD8 wells had better consistency in the two-well comparison and exhibited a morphology tending to be stable. The S2 layer serves as a flag layer and exhibits a consistent state. In the S3 drilling process, the dip angle of the GD7-3-5H well stratum is 8 degrees, the horizontal displacement is large, the difference between the apparent thickness and the true thickness is large, but the shape is consistent in the stratum comparison process. The summary data forms an elemental log and a stratigraphic contrast, see FIG. 1.
Example 2
A method for identifying and comparing stratums by using element comparison relations comprises the following specific steps:
and 2, establishing an element stability index model of the adjacent well, and summarizing morphological characteristics and quantitative characteristics of the element stability index according to the model and stratum information to form bottom layering and characteristic summarization.
step 4, t, comparing the element stability index morphological characteristics of different depths with the quantitative characteristics through QY2H, and drilling the repetitive characteristics of the encountered horizon;
and 5, determining the drilling characteristics of the stratum to be drilled of the QY2H, and guiding the lower working condition.
When the QY2H well is drilled at the level of a target stratum, the steps 3, 4 and 5 of the method are mainly applied.
When the QY2H well is drilled to 3015m, by applying a method for identifying and comparing the stratum by using element comparison relationship, the following conclusions can be reached:
when the QY2H well is drilled to 3473m, the formation reverse repetition starts to occur, the formations 3130-3158m and 3538-3550m are obviously repeated, the corresponding element stability indexes are 0.5856 and 0.5858, and the change rate of the average value of the element stability index is 0.034%; the repeated formations 3452, 3508m and 3190, 3246m correspond to the element stability indexes 0.7057 and 0.6982, the average value change rate of the element stability index is 1.07%, the formations exhibit reverse repetition, and the symmetrical point is 3375 m. Indicating that the well is at risk of going up. The element stability index changes for the same horizon due to: 1. instrumental and operational errors. 2. The well deviation and the inclination angle of the horizontal well drilling in the same layer are inconsistent, so that the difference of analysis samples is caused. In conclusion, the slant drilling starts at the well depth 3555m and returns to the target zone, as shown in fig. 2.
In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (8)
1. A method for identifying and comparing stratums by using element comparison relations is characterized by comprising the following steps:
step 1, collecting element logging data of adjacent wells of a well, and calculating the relative content of each element logging;
step 2, establishing an element stability index curve of an adjacent well, and summarizing element stability index morphological characteristics and quantitative characteristics, wherein the element stability index is an endogenous mineral indicating element/an injected mineral indicating element;
step 3, acquiring element logging data of the well drilling through element logging work of the well drilling, calculating an element stability index of the well drilling, summarizing and concluding morphological characteristics and quantitative characteristic summarization of the element stability index of the well drilling;
step 4, comparing the element stability index morphological characteristics and the quantization characteristics of the drilling well and the adjacent well to identify a drilling position of the drilling well, and comparing the element stability index morphological characteristics and the quantization characteristics of the drilling well at different depths to determine the drilling fault, the drilling interlayer and the drilling fault on the well track of the drilling well;
and 5, determining the characteristics of the stratum to be drilled and encountered in the well drilling, including fault, stratum repetition and stratum loss characteristics, and judging the drilling-through drilling condition of the target layer of the well drilling to form a stratum layer specification to be drilled and encountered.
2. The method of using element-by-element correlation for formation identification and correlation as defined in claim 1, wherein the element log data comprises: ca element, Mg element, Si element, Fe element, Al element, Mn element and Ti element.
3. The method for identifying and comparing stratum by using element comparison relationship according to claim 2, wherein the indicator elements of endogenous minerals in step 2 are Ca element and Mg element; the mineral injection indicating elements are Si, Fe, Al, Mn and Ti.
4. The method for identifying and comparing stratum by using element comparison relation as claimed in claim 3, wherein the element stability index is (A + B)/(C + D + E + F + G)
Wherein, A-the relative content of Ca element (%) -measured in element log
B-relative content of Mg element (%) -measured by element logging
C-Al element relative content (%) -measured by element logging
D-relative content of Fe element (%) -measured by element logging
E-relative content of Si element (%) -measured in elemental logs
F-relative content of Ti element (%) -measured in element log
G-relative content (%) of Mn element determined by elemental logging.
5. The method for identifying and comparing the formations by utilizing the element comparison relationship according to claim 1, wherein the element stability index morphological characteristics refer to that the element stability index curve morphology is linear, zigzag, box, step and sharp knife, the quantitative characteristics refer to the height characteristics of the relative content comparison value of the endogenous minerals and the index elements of the injected minerals in the deposition process, the injected minerals are more, the endogenous minerals are less, the injected minerals are relatively unstable, the injected minerals are less, the endogenous minerals are more, the injected minerals are relatively stable, and the quantitative characteristics are extremely unstable, namely the element stability index is less than or equal to 0.2; the element stability index is more than 0.2 and less than or equal to 0.5; the stability is more than 0.5 and the element stability index.
6. The method for identifying and comparing strata according to claim 1 wherein in step 4, the element stability index of the drilled well and the adjacent wells is displayed on the log in a linear scale, and the drilled horizon and the characteristic are determined by morphological feature comparison.
7. The method for identifying and comparing stratums by using element comparison relationship according to claim 1, wherein in the step 4, the upward-pointing bit encounters the same horizon, the element stability index morphological feature presents retrograde repetition, the quantitative feature comparison of the two same horizons encountered by the bit is less than 1%, and the comparison formula is as follows: (S1 x 2-S1 x 2)/(S1+ S1 x 100%), wherein S1-average value of stability index of formation elements encountered during drilling for the first time, and S1-average value of stability index of formation elements encountered during drilling for the second time; the lower indication means that the lower part of a target layer is drilled, the drill meets a new stratum, the morphological characteristics of the element stability index have mutation, the quantitative characteristic comparison is more than or equal to 1 percent, and the comparison formula is as follows: (Sm x 2-Sms x 2)/(Sm + Sms) x 100%, wherein Sm-average value of element stability index 10-20m before drilling through a target layer and Sm-average value of element stability index when drilling in a new formation; in a fault, the morphological characteristics of element stability indexes are mutated, the quantitative characteristic comparison is more than or equal to 1 percent, and the comparison formula is as follows: (SsX 2-SxX 2)/(Ss + Sx) x 100%, wherein the average value of the Ss-element stability index before drilling through a target layer is 10-20m, the average value of the Sx-element stability index when drilling meets a new stratum is obtained, a well track enters a descending disc from an ascending disc, the stratum is lost, the morphological characteristics of the element stability index have no repeated rule, and the element stability index is mutated at a breakpoint and enters the ascending disc from the descending disc, the element stability index is mutated at the breakpoint, and the forward repeated characteristics of the drilled stratum and the upper drilled stratum appear; in the interlayer, the morphological characteristics of the element stability index have mutation, the quantitative characteristic contrast is more than or equal to 1 percent, and the contrast formula is as follows: (Sjq X2-Sj X2)/(Sjq + Sj). times.100%, after the well track is drilled through the interlayer, returning to the target layer, and comparing the quantitative characteristics of the element stability index with the drilled target layer by less than 1%, wherein the comparison formula is as follows: (Sjq X2-Sjh X2)/(Sjq + Sjh) X100%, wherein Sjq is the average value of element stability index of 10-20m before drilling into interlayer; sj-average value of element stability index of diamond encountering interlayer, and Sjh-average value of element stability index of 10-20m after diamond encountering interlayer.
8. The method for identifying and comparing strata by using element comparison relationship as claimed in claim 1, wherein in the step 5, the fault is morphological feature forward repetition or quantitative feature mutation feature, the stratum repetition is morphological feature reverse repetition feature, the stratum deletion is quantitative feature mutation feature, and the stratum division result is formed by logging graphs and descriptions.
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Cited By (3)
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|---|---|---|---|---|
| CN112160740A (en) * | 2020-09-08 | 2021-01-01 | 中石化石油工程技术服务有限公司 | Horizontal well target layer microstructure determination method based on element logging |
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