CN110703325B - Hydrocarbon source identification method based on structure difference activity - Google Patents
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
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Abstract
The invention discloses a hydrocarbon source identification method based on construction difference activity, which comprises the following steps: s1, determining the uplift shaping period of the lake basin according to the contact relation between the front growth stratum and the growth stratum of the lake basin; s2, dissecting the hollow structural features of the lake basin according to the determined uplift shaping period, dividing a structure-deposition response mode of the lake basin by combining the seismic facies, the sedimentary facies and the sedimentation rate of the lake basin, qualitatively identifying the distribution of hydrocarbon source rocks, and establishing a hollow transition migration control hydrocarbon analysis method; s3, fitting an A-L curve method to semi-quantitatively calculate the change trend of the scale of the source rock along with the fracture trend of the controlled hollow according to the construction parameters for controlling the distribution width and the deposition thickness of the lake basin in the deposition period; s4, performing mutual evidence of qualitative identification and semi-quantitative calculation, and determining the development scale of the source rock. The hydrocarbon source identification method based on the structure difference activity provided by the invention obtains the hydrocarbon source rock identification technology by mutual evidence of semi-quantitative calculation and qualitative analysis, and has higher reliability.
Description
Technical Field
The invention relates to the technical field of hydrocarbon source rock identification in the initial stage of petroleum geological exploration, in particular to a hydrocarbon source identification method based on structure difference activity for a continental facies dustpan-shaped half-cut lake basin.
Background
In the field of petroleum geology, the lake basin undergoes strong fracture movement or uplift transformation in the deposition period or after deposition, and the formed depressions with complex structure and difficult prototype basin identification are called as 'transformation depressions' for short. In the hollow oil-gas exploration, if no well or few wells encounter hydrocarbon source rocks, whether the hydrocarbon source rock distribution in an oil production area can be accurately evaluated or not can be judged, and the method plays an important indication role in resource evaluation and whole exploration deployment.
For a well-free or a well-poor area, the development of the hydrocarbon source rock prediction method and technology mainly comprises the following aspects: (1) the method is characterized by comprising a tectonic evolution analysis method, namely discussing the control effect of tectonic movement on the development of the hydrocarbon source rock from the aspects of sedimentation rate, sedimentation rate/sedimentation rate, fault activity rate, extension rate and the like; (2) the method comprises the steps of analyzing and identifying the stratum sequence, namely analyzing and considering the sediments near the maximum flooding period as possible hydrocarbon source rock development layer sections from the viewpoint of the stratum sequence and the stratigraphy; (3) and identifying the high-quality hydrocarbon source rock by using the seismic facies. The hydrocarbon source identification method is mainly a qualitative identification method, is relatively single, and cannot be used for effectively identifying the hydrocarbon source rock for the depression subjected to strong reconstruction of the construction activity.
Aiming at the depression of the hydrocarbon source rock of the medium-deep lake phase encountered by the non-well drilling, no effective method for quantitatively evaluating the hydrocarbon source rock is formed.
Disclosure of Invention
The invention aims to provide a hydrocarbon source identification method based on structure difference activity, which is proved by semi-quantitative calculation and qualitative identification.
The technical scheme adopted by the invention for solving the technical problems is as follows: the hydrocarbon source identification method based on the construction difference activity is used for predicting the scale of hydrocarbon source rocks in a continental-facies dustpan-shaped fractured lake basin and comprises the following steps:
s1, determining the uplift shaping period of the lake basin according to the contact relation between the front growth stratum and the growth stratum of the lake basin;
s2, dissecting the hollow structural features of the lake basin according to the determined uplift shaping period, dividing a structure-deposition response mode of the lake basin by combining the seismic facies, the sedimentary facies and the sedimentation rate of the lake basin, and qualitatively identifying the distribution of hydrocarbon source rocks so as to establish a hollow transition migration control hydrocarbon analysis method;
s3, fitting an A-L curve method to semi-quantitatively calculate the change trend of the scale of the source rock along with the fracture trend of the controlled hollow according to the construction parameters for controlling the distribution width and the deposition thickness of the lake basin in the deposition period;
wherein A represents the holding space of the lake basin, and L represents the trend of the lake basin;
s4, determining the development scale of the source rock by mutual evidence of the qualitative identification obtained in the step S2 and the semi-quantitative calculation obtained in the step S3.
Preferably, in step S1, the contacting relationship between the pre-growth formation and the growth formation includes:
when the deposition rate is greater than the heave rate, the growing formation is retrograde deposited above the previously growing formation; when the deposition rate < the heave rate, the growing formation overburden deposits above the pre-growing formation.
Preferably, in step S2, the dimples are divided into: a rotating domino type half cutting, a typical dustpan shaped half cutting, a gentle slope ablation type dustpan shaped half cutting and a rising modified dustpan shaped half cutting.
Preferably, in step S2, the configuration-deposition response pattern of the lake basin includes a rotational domino type half moat, a typical skip type half moat, and a rising modified type half moat.
Preferably, in step S3, the construction parameters include the receivable space a of the lake basin; the thickness h of a vertical stratum in the sedimentary period is m; a gentle slope zone stratum dip angle alpha, a steep slope section dip angle beta and an included angle theta between a main stress direction and a fault trend direction; a is calculated according to the following formula (1):
preferably, in step S3, in order to eliminate the influence of the deposit thickness dimension and the numerical magnitude, the result obtained by formula (1) is divided by 10000 to obtain a dimensionless value a, which is proportional to the size of the hydrocarbon source and is used for representing the size of the hydrocarbon source development during the depression deposition period.
Preferably, in step S2, after qualitatively identifying the distribution of the source rock, a hydrocarbon generation intensity contour map is generated;
in step S4, the hydrocarbon generation intensity contour map is compared with the A-L curve.
The invention has the beneficial effects that: a hydrocarbon source rock qualitative identification method is established, meanwhile, a set of hydrocarbon source scale semi-quantitative calculation method is fitted according to structural parameters for controlling the distribution range and the deposition thickness of the lake basin in the deposition period, and semi-quantitative calculation and qualitative analysis are mutually proved to obtain a hydrocarbon source rock identification technology, so that the reliability is higher.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a hydrocarbon source identification method based on construction difference activity of the present invention;
FIG. 2 is a schematic illustration of the contact relationship of a pre-growth formation with a growth formation in accordance with the present invention;
FIG. 3 is a schematic sectional view of a breakwater lake basin according to the present invention;
FIG. 4 is a characteristic view of the forward extension of the lake basin in the present invention;
FIGS. 5 and 6 are comparative plots of the A-L curve method of the present invention in EP17 puddles and LF13E puddles four-segment hydrocarbon source identification;
FIG. 7 is a sectional view of a major depression in the Xijiang river;
FIG. 8 is a schematic view of the stratum contact relationship between the Xijiang 32 raised area and the Xijiang 28 raised area in the main depression of the Xijiang;
FIG. 9 is a schematic diagram of the evolution mode of major depression in the Xijiang river;
FIG. 10 is a present-today hydrocarbon intensity contour plot at each time of West Jiang Main depression Wenchang period;
FIG. 11 is the "A-L" graph of the Wenchang period in the Xijiang province.
Detailed Description
The invention discloses a hydrocarbon source identification method based on construction difference activity, which can be used for predicting the scale of hydrocarbon source rocks in a continental facies dustpan-shaped fractured lake basin, and comprises the following steps:
s1, determining the uplift shaping period of the lake basin according to the contact relation between the front growth stratum (the stratum which develops before uplifting) and the growth stratum (the stratum which develops after uplifting).
The bottom age of the growing stratum is the initial formation age of growing folds, the growing stratum may form different levels of overburden or retreating unconformity surfaces in the deposition process, and the end of one-time structural deformation can be represented within a certain range. The curse of the construction activity can be divided in detail by using the sequence for growing the development of the unconformity. For example, a first lift, when the deposition rate (Rs) > lift rate (Ru), the growth formation is retrograde deposited above the previous growth formation, as shown in fig. 2 (a); when the deposition rate < the uplift rate, the growing formation is overburden deposited over the pre-growing formation, as shown in fig. 2 (b). For another example, in a two-phase heave, at a first phase heave deposition rate > heave rate, and at a second phase heave deposition rate < heave rate, the growing formation overburden deposits over the pre-growing formation during the first phase and overburden deposits over the pre-growing formation during the second phase; otherwise, the first annealing and then the second annealing are performed.
S2, finely dissecting the hollow structure characteristics of the lake basin according to the determined uplift shaping period, dividing the structure-deposition response mode of the lake basin by combining the seismic facies, the sedimentary facies and the sedimentation rate of the lake basin, and qualitatively identifying the distribution of the hydrocarbon source rocks to obtain the hollow transition migration control hydrocarbon analysis method.
The hollow structure can be divided into the following four types of sections according to hollow structure characteristics: a rotating domino type half cutting, a typical dustpan shaped half cutting, a gentle slope ablation type dustpan shaped half cutting and a rising modified dustpan shaped half cutting.
The typical skip-shaped half cutting and the slope-relieving ablation-type skip-shaped half cutting are different in whether the two types of profiles are ablated at the end of the Wenchang group, so that the two types of profile structures can be classified into a type of structure-deposition response mode, and therefore, the structure-deposition response mode of the lake basin can comprise three types of rotating domino-type half cutting, typical skip-shaped half cutting and bump-modified half cutting.
After the distribution of the source rocks is qualitatively identified, a hydrocarbon generation intensity contour map is generated by basin simulation software and is expressed by the hydrocarbon generation intensity contour map.
And S3, fitting an A-L curve method to semi-quantitatively calculate the change trend of the scale of the hydrocarbon source rock along with the fracture trend of the controlled hollow according to the structural parameters for controlling the distribution width and the deposition thickness of the lake basin in the deposition period. Wherein A represents the accommodation space of the lake basin, and L represents the trend of the lake basin.
In the half-moat fault-sunk lake basin, the accommodation space of the lake basin in a certain period is determined by the combination of the gentle slope zone base lifting and tilting movement, the steep slope zone main control fracture movement characteristic, the horizontal plane characteristic of the lake basin and the action of the regional stress field, as shown in fig. 3. The research shows that: (1) two-dimensional geometric analysis shows that the accommodation space of the lake basin in a certain deposition period is determined by the vertical deposition thickness h, the included angles between the steep slope fracture surface and the base bottom surface of the gentle slope zone and the horizontal plane; (2) the lake basin expansion is proportional to the stress component of the regional stress field in the direction perpendicular to the dip strike. The parameters can be approximately fitted with a formula for rapidly calculating the lake basin receivable space A (accommodation space) to represent the receivable space of the lake basin in a certain two-dimensional space in a deposition period, and researches prove that the scale of the hydrocarbon source and the receivable space of the lake basin have positive correlation, so that the migration characteristics of the receivable space A of the lake basin in the certain deposition period along with the trend L (long axis) of the lake basin in the two-dimensional space are counted, and the distribution characteristics of the scale of the hydrocarbon source of the lake basin in the certain deposition period in the three-dimensional space are obtained.
The formula for A is shown in the following formula (1):
in the formula, A is the accommodation space of the lake basin (indirectly reflecting the development scale of a hydrocarbon source), h is the thickness of a vertical stratum in a certain sedimentation period and the unit m; alpha is a gentle slope zone stratum inclination angle; beta is the steep slope section dip angle; theta is an included angle between the main stress direction and the fault trend direction. h. Alpha and beta can be read from the depression structure and deposition research result, and theta is determined by the direction of the regional stress field, according to the existing research results, the direction of the regional stress field is in the NW-SE direction at the lower stage of the Wenchang group, and the direction of the regional stress field is in the NNW-SSE direction at the upper stage of the Wenchang group. The angle theta between the main stress direction of the stress field in the region and the fault trend direction under the condition that the lake basin is extended in the forward direction is shown in figure 4.
For example, a of a certain two-dimensional cross section is calculated as 13670, taking h as 100m, α as 30 °, β as 45 °, and θ as 90 °. To eliminate the effect of the deposition thickness dimension and the magnitude of the value, the calculation result is divided by 10000, as shown in the following formula (2):
the obtained A value is dimensionless and is proportional to the development scale of the hydrocarbon source, and the development scale of the hydrocarbon source in a depression certain sedimentation period can be characterized.
The above formula should be confirmed with the evaluation criteria as follows:
the pearl-depression is located in the pearl estuary basin (east part) of the mainland in the northern part of the south sea, the ancient Wenchang group is a main hydrocarbon layer, a middle-deep lake facies argillaceous hydrocarbon source rock is taken as a main source rock, and a plurality of secondary depressions develop inside the depression, wherein the well-drilled abundant hydrocarbon depressions comprise EP17 depressions and LF13E depressions. The hydrocarbon source scale distribution characteristics of the two dominant hydrocarbon source rock layer sections, namely the Wen four sections, which are proved to be rich in hydrocarbon pits are calculated by utilizing an A-L curve method, and are compared with the existing results of the respective Wen four sections hydrocarbon generation intensity contour distribution diagram: as shown in fig. 5, in which (a) is an "a-L" plot of the four well segments of EP17, and (b) is a plot of the hydrocarbon generation intensity contours of the four well segments of EP17, the circles in the plot (b) from the inside out of the distribution represent hydrocarbon generation intensity contours, and also represent a gradual decrease in the size of the hydrocarbon source from the inside out; according to the EP17 depressed four-segmented hydrocarbon-producing intensity contour plot, the hydrocarbon source scale is largest between sampling distances of 6-32km and small between sampling distances of 36-50 km. In FIG. 6, (a) is an "A-L" graph of LF13E well-formed quadrant, and (b) is an LF13E well-formed quadrant hydrocarbon generation intensity contour distribution graph, wherein the circles of the distribution in (b) represent hydrocarbon generation intensity contours and also represent the gradual decrease of the hydrocarbon source scale from inside to outside; also according to the contour distribution of the hydrocarbon generation intensity in the four sections of the hollow of LF13E, the hydrocarbon source scale is largest between the sampling distances of 8-24km and is small between the sampling distances of 0-6km and 26-30 km. The scale of hydrocarbon sources of EP17 pools and LF13E pools calculated by the curve method of A-L is well consistent with the scale, and a dividing basis for judging the scale of the hydrocarbon sources by the curve method of A-L is established, namely the scale hydrocarbon generation can be determined when the scale of the hydrocarbon sources in the curve of A-L is more than 15 (the value of A is more than 15), and the hydrocarbon generation capacity is stronger when the numerical value is larger; less than 15 is poor in hydrocarbon-producing ability.
S4, determining the development scale of the source rock by mutual evidence of the qualitative identification obtained in the step S2 and the semi-quantitative calculation obtained in the step S3.
And comparing the A-L curve obtained by semi-quantitative calculation with the contour map obtained by qualitative identification, and determining the development scale of the hydrocarbon source rock according to the matching result of the A-L curve characteristics and the contour map.
The invention is explained in detail by identifying the ancient and near series Wenchang hydrocarbon source rock in the main depression of the West river in the Yangtze river basin.
The geological background of the main depression area of the West river indicates that the main depression of the West river is a secondary negative direction structural unit inside a down depression of a pearl in a basin (east part) of the Zhujiang mouth, the east part and the west part are respectively connected with the Huizhou depression and the Enping depression, the south part and the north part are respectively clamped by a central ridge and a north ridge, and the depression area is about 1090km2Under the control of a north boundary fault, the main depression of the west river is integrally represented as a dustpan-shaped structure of 'north breaking south surpassing', and as shown in fig. 7, four secondary depressions, namely 28 depressions in the west river, 33 east depressions in the west river, 33 west depressions in the west river and 32 depressions in the west river, develop from the east to the west. Recent research and statistics show that the Wenchang group mainly takes lake-phase deposition, and develops 5 reflecting strata comprising Tg, T84, T83, T82 and T80 from bottom to top, wherein the Tg and the T80 are respectively non-integrated interfaces in an area formed by a bead-shaped moving first curtain and a bead-shaped moving second curtain, and other interfaces are local non-integrated interfaces in the Wenchang group. The above 5 reflecting layers divide the Wenchang group into 5 layer sections of six + five sections, four sections, three sections and two + one section from bottom to top. Until now, the depression has been drilled in two oil-bearing formations, which proves that the depression has the hydrocarbon generation potential, but the depression has no well drilling in the central stratum of the lake basin, and the drilling of the depression edge does not disclose the middle-deep lake facies mudstone. In view of the above situation, the scale of hydrocarbon source development in the region was quantitatively evaluated by the above-described hydrocarbon source rock evaluation method.
And step S1, determining the forming time of the Xijiang 32 bump and the Xijiang 28 bump according to the contact relation between the previous growth stratum and the growth stratum.
(1) The Xijiang 32 uplifting Wenchang undergoes two-stage uplifting effects, namely the final stage of the lower Wenchang group and the final stage of the upper Wenchang group, and two unconformity interfaces T83 and T80 for the Wenchang main depression and western development, wherein the T83 interface is an unconformity interface of a region in which depressions develop internally, a remarkable stratum overburden deposition characteristic is visible on the interface, the stratum in the lower Wenchang group developing below the interface is integrally lifted and has a developing magma invasion effect, and the phenomenon records that one strong uplifting effect exists at the final stage of the lower Wenchang group represented by the T83 interface, as shown in figure 8. The T80 interface is a zone unconformity interface, below which the formation strongly denuded features and above which the formation significantly overcasts the sedimentary features, indicating that there is a strong uplift effect at the end of the wenchang group, as shown in (a) of fig. 8.
(2) The west river 28 hump is a basal hump, but experiences volcanic invasion in the zhuang moving two curtains, the periphery of the hump area of the west river 28 presents parallel unconformity reflection characteristics at the interface of the three-level sequence in the wenchang group, and the stratum in the three-level sequence presents an overlap characteristic and is deposited on the interface of the three-level sequence, which indicates that the west river 28 hump is a basal paleo-hump and has continuous hump characteristics in the deposition process of the wenchang group, as shown in the third graph in fig. 8. Due to the invasion effect of the magma, the stratum and the raised area of the west river 28 are in a zigzag contact relationship, as shown in the fourth step in fig. 8, and the local parts of the first and second strata have obvious volcanic invasion characteristics, and the fact that the first volcanic activity exists in the raised area of the west river 28 in the second curtain period of the bead-shaped dragon movement is inferred.
And step S2, establishing a hollow change migration control hydrocarbon analysis method.
Firstly, on the basis of establishing the forming time of the main depression of the west river, different section structures of the main depression of the west river are analyzed in detail, and the main depression structure of the west river can be divided into four types of section evolution structures from east to west as shown in fig. 9, wherein the four types of section evolution structures respectively comprise: rotating domino type half cutting ((r) in figure 9), typical dustpan shaped half cutting ((r) in figure 9), gentle slope ablation type dustpan shaped half cutting ((r) in figure 9), and bulge modified dustpan shaped half cutting ((r) in figure 9). The region can be divided into three types of structure-deposition response modes according to the evolution structure of the 4 types of sections of the main depression in the Xijiang (the difference between a typical skip-shaped half-cut and a slow slope ablation-type skip-shaped half-cut is that whether the two types of sections have ablation action at the end of the Wenchang group, so that the two types of section structures can be classified into one type of structure-deposition response mode), the conclusion is drawn when researching the offshore lake basin according to the Gong re-rise and the like, namely when the subsidence rate of the collapse period is 200-400m/Ma, the lake basin reaches the tripod flourishing period to be beneficial to the development of the hydrocarbon source rock, and the structure-deposition response mode of the main depression in the Xijiang comprises the following steps: rotating domino type half graben, typical dustpan shaped half graben and rising modified dustpan shaped half graben.
The rotary domino type half-through is controlled by a plurality of main control fractures inclining in the same direction and distributed in 28-east parts of the west river and 33-east parts of the west river, wherein the sedimentation rate of a steep slope zone in the east part of the west river 33-east part of the west river is more than 200m/Ma in the early stage of strong subsidence, namely the four deposition periods of the Wen river, and the zone is a hydrocarbon source development favorable zone in the zone. The typical dustpan-shaped half cut is controlled by a master control fracture to form a dustpan-shaped half cut with a north-breaking south-surpassing part, and the dustpan-shaped half cut is distributed in the west part of the 33 east-hollow west of the west river and the east part of the 33 west-hollow west of the west river; in the strong collapse period, namely deposition periods of the four paragraphs and the three paragraphs, the main control is to break and move strongly, the gentle slope belt rotates, the sedimentation rate of the center of the lake basin is more than 200m/Ma, and the water body is in an under-compensated deposition environment, so that the development of the hydrocarbon source rock of the medium-deep lake phase is facilitated. In the late stage of deposition in four sections of Wen, a Xijiang 32 is strongly raised to divide a Xijiang main depression into a Xijiang 33 depression and a Xijiang 32 depression, the Xijiang 33 depression is influenced by the rising and raising action of the Xijiang 32 and the strong action of main control fracture, the Xijiang 33 depression has the characteristic of narrow water depth of a lake, the settling rate is more than 200m/Ma, and a middle-deep lake-phase hydrocarbon source rock develops; in the weak collapse period, namely the deposition period of the first and second West river periods, the main control fracture activity is weakened, but the formation of the Xijiang river 32 bulge is not beneficial to the injection of stratum sources in the gentle slope zone, and the water body is still in an under-compensated environment and develops the mid-deep lake-phase hydrocarbon source rock.
According to different zone structure-sedimentary response modes in the West river main depression Wenchang period and the sedimentary facies characteristics of seismic facies, qualitatively identifying the distribution of the hydrocarbon source rocks in different sedimentary periods, and calculating the hydrocarbon intensity contour map of each current period by adopting the geological basin simulation software so as to lay a foundation for comparison with the subsequent semi-quantitative prediction. FIG. 10 is a contour diagram of the current hydrocarbon intensity at each time of West river Main depression Wenchang, wherein (a), (b) and (c) are the contour diagrams of the current hydrocarbon intensity at the first-Wen + second-stage, the third-Wen-third-stage and the fourth-West-fourth-stage, respectively.
And step S3, utilizing the A-L curve to judge the scale of the hydrocarbon source.
FIG. 11 is the "A-L" curve diagram of the main depression in Xijiang in Wenchang period, in which (a), (b) and (c) are the "A-L" curves of the first-two-stage Wen, the third-three-stage Wenchang and the fourth-four-stage Wenchang respectively. Overall, the main depression in west river has characteristics of migration from east to west from the next wenchang group to the wenchang group: the sampling distance of the deposition period in the Wenzhou section is 16-20km and 24-40km, the hydrocarbon generation scale is strong, and the hydrocarbon generation scale of the Xijiang 33 west depression is weaker than that of the Xijiang 33 east depression; the hydrocarbon generation scale in the deposition period of the Wenzthree section is maximum, and the hydrocarbon generation scale is strong at sampling distances of 10-20km and 34-40 km; meanwhile, the hydrocarbon generation scale of the Xijiang 33 Xijiang is larger than that of the Xijiang 33 east; the hydrocarbon generation scale in the first and second deposition periods is obviously reduced, but small-scale hydrocarbon generation still exists in the east and west depressions of the Xijiang 33.
And S4, verifying hydrocarbon generation potential of the main depression of Xijiang by mutual evidence of semi-quantitative calculation and qualitative analysis.
By combining the graphs shown in fig. 10 and fig. 11, the a-L curve method of the main depression of the west river is compared with the qualitative recognition result of the hydrocarbon source, and from the qualitative recognition result of the depression transition, it can be seen that the main depression of the west river has the potential of generating hydrocarbons in the fourth, third and first and second sections. In the longitudinal direction, the hydrocarbon source scales of different layers are different, the hydrocarbon source scale of the Xijiang 33 east hole in the West four section is larger, the hydrocarbon source rock of the Xijiang 33 east hole in the West three section is developed in the West three section, but the hydrocarbon source scale of the Xijiang west hole is larger than that of the Dongbai, the Xigbai and the Xigbai in the West two section still have a certain hydrocarbon source scale, the result predicted by the A-L curve method is compared with the hydrocarbon source rock today hydrocarbon intensity isoline distribution recognized by the qualitative method, and the two hydrocarbon source rocks have good coincidence.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A hydrocarbon source identification method based on construction difference activity is used for predicting the scale of hydrocarbon source rocks in a continental-facies dustpan-shaped fractured-sunken lake basin, and is characterized by comprising the following steps of:
s1, determining the uplift shaping period of the lake basin according to the contact relation between the front growth stratum and the growth stratum of the lake basin;
s2, dissecting the hollow structural features of the lake basin according to the determined uplift shaping period, dividing a structure-deposition response mode of the lake basin by combining the seismic facies, the sedimentary facies and the sedimentation rate of the lake basin, and qualitatively identifying the distribution of hydrocarbon source rocks so as to establish a hollow transition migration control hydrocarbon analysis method;
s3, fitting an A-L curve method to semi-quantitatively calculate the change trend of the scale of the source rock along with the fracture trend of the controlled hollow according to the construction parameters for controlling the distribution width and the deposition thickness of the lake basin in the deposition period;
wherein A represents the holding space of the lake basin, and L represents the trend of the lake basin; counting the migration characteristics of the containable space A of the lake basin in a certain sedimentation period along with the trend L of the lake basin in the two-dimensional space to obtain the distribution characteristics of the hydrocarbon source scale of the lake basin in the certain sedimentation period in the three-dimensional space;
the construction parameters comprise a receivable space A of the lake basin; the thickness h of a vertical stratum in the sedimentary period is m; a gentle slope zone stratum dip angle alpha, a steep slope section dip angle beta and an included angle theta between a main stress direction and a fault trend direction; a is calculated according to the following formula (1):
s4, determining the development scale of the source rock by mutual evidence of the qualitative identification obtained in the step S2 and the semi-quantitative calculation obtained in the step S3.
2. The method for identifying hydrocarbon sources based on formation difference activity according to claim 1, wherein in step S1, the contact relationship between the pre-growth formation and the growth formation comprises:
when the deposition rate is greater than the heave rate, the growing formation is retrograde deposited above the previously growing formation; when the deposition rate < the heave rate, the growing formation overburden deposits above the pre-growing formation.
3. The hydrocarbon source identification method based on construction difference activity according to claim 1, wherein in step S2, the dimples are classified according to the dimple structure characteristics as: a rotating domino type half cutting, a typical dustpan shaped half cutting, a gentle slope ablation type dustpan shaped half cutting and a rising modified dustpan shaped half cutting.
4. The hydrocarbon source recognition method based on construction difference activities according to claim 1, wherein in step S2, the construction-deposition response patterns of the lake basin include rotational domino type half moats, typical skip type half moats and uplift modified type half moats.
5. The method for identifying a hydrocarbon source based on construction difference activity as claimed in claim 1, wherein in step S3, in order to eliminate the influence of the deposit thickness dimension and the numerical magnitude, the result obtained by the formula (1) is divided by 10000 to obtain an A 'value, and the A' value is proportional to the size of the hydrocarbon source to characterize the development scale of the hydrocarbon source in the depression deposition period.
6. The hydrocarbon source identification method based on the structure difference activity as claimed in any one of claims 1 to 5, wherein in step S2, after the distribution of the hydrocarbon source rock is qualitatively identified, a hydrocarbon generation intensity contour map is generated;
in step S4, the hydrocarbon generation intensity contour map is compared with the A-L curve.
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