CN103590822A - Method of judging low-resistivity annulus formed in formation - Google Patents
Method of judging low-resistivity annulus formed in formation Download PDFInfo
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- CN103590822A CN103590822A CN201210293217.7A CN201210293217A CN103590822A CN 103590822 A CN103590822 A CN 103590822A CN 201210293217 A CN201210293217 A CN 201210293217A CN 103590822 A CN103590822 A CN 103590822A
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Abstract
The invention belongs to the technical field of petroleum exploration and development, in particular to an oil and gas reservoir recognition method applied to qualitatively analyzing existence of oil reservoirs through detection data, and provides a method of judging a low-resistivity annulus formed in a formation. The method includes: acquiring core data and determining irreducible water saturation Swb and residual oil saturation Sor of a core; acquiring a ratio of drilling fluid resistivity Rmf and formation water resistivity Rw according to the irreducible water saturation Swb and residual oil saturation Sor of the core; detecting a target formation to acquire the formation water resistivity Rw and the drilling fluid resistivity Rmf; if an actual physical value is larger than a calculated value, determining the low-resistivity annulus is formed. Through the application of the method in low-resistivity oil and gas fields, efficiency of exploiting low-resistivity oil and gas reservoirs can be improved effectively, the low-resistivity oil and gas reservoirs are recognized visually and quickly, exploration cost is reduced, and economic benefit is increased. As China possesses many low-resistivity oil and gas reservoirs, the method has promising application prospect.
Description
Technical field
The invention belongs to petroleum exploration and development technical field, relate in particular to a kind of oil-gas reservoir identification method, how by detection data qualitative analysis oil reservoir, to exist.
Background technology
In the technology of judgement low resistivity hydrocarbon layers, low-resistance endless belt refers to flushed zone resistivity in reservoir, intermediate zone resistivity and virgin zone resistivity, in the minimum situation of intermediate zone resistivity, reservoir intermediate zone is called to low-resistance endless belt.When stratum detecting arrives low-resistance endless belt, illustrate that stratum exists oil gas, this point is confirmed by logging community already, also there is people to verify by experiment in mud invaded formation process, along mud, invade direction and have the appearance of low-resistance endless belt, mono-kind of < < optimizes drilling mud and identifies fast the necessary condition that the method > > of low resistivity hydrocarbon layers has proposed to form low-resistance endless belt, by this patent content, can make stratum form low-resistance endless belt.
In oil exploration process, identify low-resistance endless belt, because the investigation depth of array logs is different, conventionally can find low-resistance endless belt.Low-resistance endless belt is the positive evidence that contains oil gas, therefore can judge qualitatively low resistivity hydrocarbon layers by low-resistance endless belt.But because the condition of formation low-resistance endless belt is very strict, while not using the method, can not guarantee that every mouthful of well all can occur low-resistance endless belt, when not there is low-resistance endless belt, usually cause the leakage of low resistivity hydrocarbon layers, or utilize other well logging means to cause exploration cost to increase, mono-kind of < < optimizes drilling mud and identifies fast in the method > > patent of low resistivity hydrocarbon layers and proposed Mud Property method, can not describe intuitively mud resistivity and form the relation between low-resistance endless belt condition, therefore prior art is unfavorable for the exploration and development of low resistivity hydrocarbon layers.
Summary of the invention
In prior art, judgement forms low-resistance endless belt by flushed zone resistivity, intermediate zone resistivity and virgin zone resistivity relation are studied, and draws the quantification condition that forms low-resistance endless belt.Judgement physical quantity requires high, not directly perceived, need to calculate in a large number.
In order to solve technical problem of the prior art, the present invention obtains formation water resistivity and mud resistivity ratio by setting up coordinate system, use coordinate system not need on the one hand stronger professional knowledge, easy, make stratum form low-resistance endless belt quickly and intuitively, thereby identify fast low resistivity hydrocarbon layers, reduce the leakage of low resistivity hydrocarbon layers.
Summary of the invention of the present invention is as follows,
Judge that stratum forms a method for low-resistance endless belt, irreducible water saturation Swb and the residual oil saturation Sor value of coring data definite rock core; According to the irreducible water saturation Swb of described rock core and residual oil saturation Sor value, obtain the ratio of drilling mud resistivity Rmf and formation water resistivity Rw; Detection of a target stratum, obtains formation water resistivity Rw and drilling mud resistivity Rmf, and relatively actual physics value Rmf/Rw and calculated value Rmf/Rw size, if actual physics value is greater than calculated value, judges and form low-resistance endless belt.
Said method comprises,
Step 21, sets up coordinate system, and abscissa is irreducible water saturation, and ordinate is the ratio of drilling mud resistivity Rmf and formation water resistivity Rw.
Step 22, marks one group of residual oil saturation Sor isopleth in coordinate system;
The residual oil saturation that described isopleth is illustrated on this curve equates, according in formula
two resistivity ratios are relevant with the actual water saturation in irreducible water saturation, residual oil saturation and stratum, because stratum water saturation is greater than stratum irreducible water saturation, make all stratum form low-resistance endless belt, must have
according to this formula, first suppose that residual oil saturation is constant, resistivity ratio become and irreducible water saturation between relation.
Step 4, the resistance ratio obtaining according to the formation water resistivity Rw collecting and step 3 is determined and is produced the minimum drilling mud resistivity Rmf of low-resistance endless belt;
Step 5, determining step: when the actual well drilled mud resistivity Rmf in the region to be measured collecting is greater than the drilling mud resistivity obtaining in step 4, stratum forms low-resistance endless belt.
Whether correct in order to verify after above-mentioned each step, described method also comprises detection verification step, to the drilling mud resistivity of the actual well drilled mud resistivity Rmf collecting and calculative determination relatively after, by instrument, region to be measured is surveyed, obtain resistivity curve, whether checking directly perceived there is low-resistance endless belt.
In concrete, described instrument be array induction or array side to instrument, and record five resistivity curves.
Described array induction or array side are 0.25～3.05M to the investigation depth of instrument, survey low-resistance endless belt, if exist low-resistance endless belt can judge stratum oil-containing, otherwise stratum oil-containing not.
The present invention can improve the discrimination of low resistivity hydrocarbon layers, thereby improve the coefficient of mining of low resistitvity reservoir, reduce cost of exploration & development, such as the bad identification of conventional method for low resistivity hydrocarbon layers, need to increase nuclear magnetic resonance log project, the expense of every mouthful of well is hundreds of thousands unit, by the inventive method, reduces this project, saves exploration expenditure.
Accompanying drawing explanation
Fig. 1 is the not fluid saturation distribution map before invaded formation of middle drilling mud;
Fig. 2 is the fluid saturation distribution map forming after drilling mud invaded formation;
Fig. 3 is the quantitative coordinate system figure of the formation low-resistance endless belt set up of the present invention.
Wherein, in Fig. 1 and Fig. 2, be 1. mud in well-drilling borehole, be 2. formation fluid saturation dimension, be 3. hydrocarbon saturation size
Concrete each width accompanying drawing is illustrated in connection with the specific embodiment
The specific embodiment
Low-resistance endless belt is the positive evidence that stratum exists movable hydrocarbon, and the mud resistivity obtaining by coordinate system judges whether stratum forms low-resistance endless belt, if form low-resistance endless belt in drilling process, illustrates it is an oil-gas Layer, otherwise can not be just an oil-gas Layer.The method is effectively improved to the exploration efficiency of low resistivity hydrocarbon layers for low resistivity hydrocarbon Tian Shangneng, the low resistivity hydrocarbon layers of identification fast directly perceived, reduces exploration cost, increases economic benefit.There are many low resistivity hydrocarbon layers in China, this invention has broad application prospects.
In Fig. 2 2., 3. in formation water saturation ratio, hydrocarbon saturation size reduce, because the phase permeability of oil phase, water varies in size, the volume that they reduce is also different, and reduce part, by drilling mud, 1. replaced, when mud resistivity is greater than the certain numerical value of formation water resistivity, make resistivity in the depth bounds of certain invaded zone be less than flushed zone resistivity and virgin zone resistivity size, thereby present low-resistance zone phenomenon.
Fig. 3 is for forming the figure of low-resistance endless belt, in figure, curve is irreducible water saturation isopleth, abscissa is irreducible water saturation, ordinate is mud resistivity and formation water resistivity ratio, when the mud resistivity of practice and formation water resistivity ratio are greater than the ratio of coordinate system, stratum can form low-resistance endless belt.
In the concrete embodiment of the present invention, low resistivity hydrocarbon layers is that the relative shoulder-bed resistivity (SBR) of reservoir resistivity is lower or absolute resistance rate is very low, by conventional resistivity instrument identification difficulty.For achieving the above object, the technological means of taking is in the present invention as follows:
(1) by this drilling and coring delivery data, determine irreducible water saturation Swb and the residual oil saturation Sor of rock core, %; (2) the formation water data obtaining according to this block is determined formation water resistivity Rw, Ω M; (3) according to irreducible water saturation Swb size, determine residual oil saturation Sor isopleth in figure; (4) according to determining the intersection point of irreducible water saturation Swb size with residual oil saturation Sor isopleth in figure, the ordinate that this intersection point is corresponding is the ratio size of drilling mud resistivity Rmf and formation water resistivity Rw; (5) according to formation water resistivity Rw, determine needed drilling mud resistivity Rmf, when the mud resistivity of actual well drilled is greater than the mud resistivity calculating in figure, stratum can form low-resistance endless belt; (6) by array induction or array side, to instrument, record five resistivity curves, investigation depth is that 0.25～3.05M surveys low-resistance endless belt, if exist low-resistance endless belt can judge stratum oil-containing, otherwise stratum oil-containing not.
Example one: old liberated area identification low resistivity hydrocarbon layers
Certain well is in exploration old block, and deep investigation resistivity value is very low, and resistivity value is less than 1.5 Ω m, and resistivity is low is because high salinity causes, is the low resistivity hydrocarbon layers of the typical high salinity origin cause of formation.Rock core irreducible water saturation is 31.6%, and residual oil saturation is 20%, and formation water analysis report shows that water type is calcium chloride, total salinity 154232mg/L, and being converted to formation water resistivity is 0.034 Ω m.According to plate, finding out the satisfied condition that forms low-resistance endless belt is R
mf/ R
w> 5.5, and actual well drilled mud resistivity is 0.45 Ω m, mud resistivity R
mfwith formation water resistivity R
wbetween satisfied relation be: R
mf/ R
w=13.2 > 5.5, meet the condition that forms low-resistance endless belt far away.Therefore will inevitably there is low-resistance endless belt in this well when well logging, in fact by array induction data, process judgement and show that stratum original state resistivity is 1.7 Ω m, intermediate zone resistivity is 1.1 Ω m, and flushed zone resistivity is 7.8 Ω m, intermediate zone resistivity is minimum, illustrates that stratum has formed low-resistance endless belt.By formation testing, confirmed stratum oil-containing, formation testing day 1.5 tons of production fluids, wherein day produce oil is 0.5 ton, moisture 68.5%, 1503.1 tons of total production fluids, 557.1 tons of tired oily produce oils.
Embodiment 2: low resistivity hydrocarbon layers is found in new district
Certain well reservoir resistivity value, lower than the resistivity value of upper and lower country rock, is to belong to the lower low resistivity hydrocarbon layers of the relative shoulder-bed resistivity (SBR) of resistivity, and oil-water-layer identification difficulty is large, and this layer is not made any judgement before this.By the parameter induction loggings such as high frequency in array induction, show, flushed zone resistivity is 10 Ω m, formation resistivity is 8 Ω m, flushed zone resistivity is greater than formation resistivity and invades for increasing resistance, be not oil-bearing layer, but invaded zone resistivity is 6.5 Ω m on ordinary meaning, invaded zone resistivity is minimum, illustrate that stratum has formed low-resistance endless belt, in reservoir, contain oil gas, comprehensive analysis and judgement are oil-water common-layer.Confirmed after tested stratum oil-containing, a day produce oil is 10t, moisture 57%.The discovery of this oil-gas Layer has been found a new oil-bearing layer at this block.
Claims (5)
1. judge that stratum forms a method for low-resistance endless belt, it is characterized in that, irreducible water saturation Swb and the residual oil saturation Sor value of coring data definite rock core; According to the irreducible water saturation Swb of described rock core and residual oil saturation Sor value, obtain the ratio of drilling mud resistivity Rmf and formation water resistivity Rw; Detection of a target stratum, obtains formation water resistivity Rw and drilling mud resistivity Rmf, and relatively actual physics value Rmf/Rw and calculated value Rmf/Rw size, if actual physics value is greater than calculated value, judges and form low-resistance endless belt.
2. a kind ofly according to claim 1 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described method comprises,
Step 1, drilling well coring data, and the irreducible water saturation Swb of definite rock core and residual oil saturation Sor value; Described rock core irreducible water saturation Swb and residual oil saturation Sor determine by core experiment;
Step 2, determines residual oil saturation Sor isopleth according to irreducible water saturation Swb size; Comprise:
Step 21, sets up coordinate system, and abscissa is irreducible water saturation, and ordinate is the ratio of drilling mud resistivity Rmf and formation water resistivity Rw;
Step 22, marks one group of residual oil saturation Sor isopleth in coordinate system, according to
according to formula, suppose that residual oil saturation is constant, resistivity ratio become and irreducible water saturation between relation, make described one group of residual oil saturation Sor isopleth;
Step 3, determine intersection point: in described coordinate system according to arbitrary irreducible water saturation Swb numerical value the intersection point on described corresponding residual oil saturation Sor isopleth, the ordinate that described intersection point is corresponding is the ratio size of drilling mud resistivity Rmf and formation water resistivity Rw;
Step 4, the resistance ratio obtaining according to the formation water resistivity Rw collecting and step 3 is determined and is produced the minimum drilling mud resistivity Rmf of low-resistance endless belt;
Step 5, determining step: when the actual well drilled mud resistivity Rmf in the region to be measured collecting is greater than the drilling mud resistivity obtaining in step 4, stratum forms low-resistance endless belt.
3. according to a kind of described in claim 1 or 2, judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described method also comprises detection verification step, to the drilling mud resistivity of the actual well drilled mud resistivity Rmf collecting and calculative determination relatively after, by instrument, region to be measured is surveyed, obtain resistivity curve, whether checking directly perceived there is low-resistance endless belt.
4. a kind ofly according to claim 3 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described instrument be array induction or array side to instrument, and record five resistivity curves.
5. according to a kind of described in claim 3 or 4, judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described array induction or array side are 0.25～3.05M to the investigation depth of instrument, survey low-resistance endless belt, if exist low-resistance endless belt can judge stratum oil-containing, otherwise stratum oil-containing not.
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| CN112711076A (en) * | 2019-10-25 | 2021-04-27 | 中国石油天然气股份有限公司 | Method and device for extracting depth of mud invading stratum in petroleum drilling |
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