CN110954969A - Method for judging and identifying hydrocarbon generation period of ancient hydrocarbon source rock - Google Patents
Method for judging and identifying hydrocarbon generation period of ancient hydrocarbon source rock Download PDFInfo
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Abstract
The invention discloses a method for judging the hydrocarbon generation period of an ancient hydrocarbon source rock, which comprises the steps of determining the stratum deletion condition, counting the thickness of the stratum and the denudation thickness and drawing a buried history map. The invention has the beneficial effects that: the method can quickly and effectively determine the hydrocarbon-producing period of the hydrocarbon source rock in the eastern ancient kingdom of China, defines the hydrocarbon-producing time of the hydrocarbon source rock, provides important support for hydrocarbon source rock evaluation and oil-gas exploration work in a research area, and has great economic benefit.
Description
Technical Field
The invention relates to an identification method, in particular to an identification method for the hydrocarbon-producing period of a hydrocarbon source rock in the ancient world, belonging to the technical field of exploration and development of petroleum and natural gas geological resources.
Background
The petroleum is called black gold, is blood of modern industrial civilization, and has irreplaceable effect on the development of national economy and human society. The eastern region of China is the earliest place to begin in the petroleum industry, early exploration is mainly focused on a new-generation stratum with shallow depth, hydrocarbon source rocks mainly comprise lake facies mudstone of an ancient system, the exploration difficulty of oil and gas resources of the new-generation community is increased along with the continuous deepening of the exploration degree, and the ancient community buried deeply gradually steps into the visual field of an exploratory to start focusing on the hydrocarbon source rocks of the ancient community. The petroleum and natural gas are formed by decomposing or pyrolyzing deposited organic matters dispersed in sedimentary rocks by microorganisms during the diagenesis period, the hydrocarbon source rock is rich in organic matters, a large amount of oil gas is generated and the oil gas is discharged, the rock can carry out hydrocarbon generation reaction when the rock is buried underground deeply and reaches a certain temperature, and the discharged oil gas is gathered into a reservoir in a trap, so that the petroleum and natural gas become an important research object for petroleum exploration. As the hydrocarbon generation reaction of the hydrocarbon source rock has irreversibility, when the stratum is lifted and the hydrocarbon source rock is separated from the original hydrocarbon generation environment, the hydrocarbon generation effect is stopped, and after the hydrocarbon source rock is buried for a period of time again, the hydrocarbon generation effect continues to occur. Therefore, the hydrocarbon generation period of the source rock is judged to be an important hydrocarbon source rock evaluation direction, and in the geological history period, different hydrocarbon generation periods and hydrocarbon generation time have important influence on the accumulation of oil and gas in ancient China.
Disclosure of Invention
The invention aims to provide a method for judging the hydrocarbon generation period of the hydrocarbon source rock in the ancient world so as to evaluate the hydrocarbon generation period and hydrocarbon generation time of the hydrocarbon source rock in the ancient world.
The invention realizes the purpose through the following technical scheme: a method for identifying the hydrocarbon-producing period of an ancient hydrocarbon source rock comprises the following steps:
step 1, determining a stratum deficiency condition, counting the layer data of five series of layers of an ancient biogenic rock overburden development triad system, a Jurassic system, a chalk system, an ancient system and a recent system of a selected area, and determining the stratum deficiency condition by using the layer data of a research area;
step 2, counting the thickness and the denudation thickness of the stratum, and respectively counting the thickness and the denudation thickness of the three-fold line, the Jurassic line, the chalk line, the ancient line and the recent line according to the horizon data of the selected area;
and 3, drawing a buried history map, carrying out hydrocarbon production evaluation on the hydrocarbon source rock, drawing the buried history map by taking the thickness of the stratum as a vertical coordinate and the deposition time of the stratum as a horizontal coordinate, and judging whether the hydrocarbon source rock produces hydrocarbon or not according to the drawn buried history map.
As a further scheme of the invention: in step 1, the stratum loss condition can be divided into: the formation is not lost; deletion of one or more of the three overlapping, Jurassic and Chalkbrood families.
As a further scheme of the invention: in the step 3, when the stratum is not lost, counting the sum of thicknesses H1 of chalks, dwarases and triassic series and the sum of thicknesses H2 of overlying strata of the hydrocarbon source rock in the horizon data; by taking the thickness of the stratum as an ordinate and the sedimentary time of the stratum as an abscissa, a buried history map is drawn, and the following conditions exist:
if H1 is more than 2000m and H2 is more than 2500m, the hydrocarbon source rock is considered to continuously generate hydrocarbon and is not interrupted;
if H1 is more than 2000m but H2 is less than 2500m, the hydrocarbon source rock is considered to be buried deep in the overburden until the time point of 2000m until 65 million years to the present, and the hydrocarbon generation is stopped until 65 million years to the present;
if H1 < 2000m but H2 > 2500m, the source rock is considered to be buried deep in the overburden to a time point of 2500m only until hydrocarbon continues to be produced today;
if H1 < 2000m and H2 < 2500m, the source rock is considered to be non-hydrocarbon bearing.
As a further scheme of the invention: in the step 3, when one or more of the three-stacked system, the dwarfism system and the chalk system are missing, counting the sum of thicknesses of the chalk system, the dwarfism system and the three-stacked system H1, the sum of thicknesses of overlying strata of the hydrocarbon source rock H2 and the cumulative denudation thickness H of the missing stratum in the horizon data, and drawing a buried history map by taking the thickness of the stratum as a vertical coordinate and the deposition time of the stratum as a horizontal coordinate, wherein the following conditions exist:
if (H1+ H) < 2000m and H2 < 2500m, the source rock is considered to be non-hydrocarbon-bearing;
if (H1+ H) < 2000m and H2 > 2500m, then the source rock is considered to be buried only as deep as 2500m in the overburden formation until now, the source rock continues to produce hydrocarbons;
if 2500m > (H1+ H) > 2000m and H2 > 2500m, the hydrocarbon source rock is considered to have primary hydrocarbon interruption, and the interruption time is the time point from the denudation of the missing stratum to the burying of the overlying stratum to the depth of (H1+ H);
if 2500m > (H1+ H) > 2000m and H2 < 2500m, it is considered that the hydrocarbon source rock continues to produce hydrocarbons only from the time point when the overburden formation is buried to 2000m to the time point when the missing formation is degraded, and thereafter the hydrocarbon production is stopped;
if (H1+ H) > 2500m and H2 > (H1+ H), the hydrocarbon source rock is considered to have primary hydrocarbon generation interruption, and the interruption time is the time point from the denudation of the missing stratum to the burying of the overlying stratum to the (H1+ H);
if (H1+ H) > 2500m and H2 < (H1+ H), it is considered that the hydrocarbon source rock continues to produce hydrocarbons only from the time point when the overburden formation is buried to 2000m to the time point when the missing formation is degraded, after which the hydrocarbon production is stopped.
The invention has the beneficial effects that: the method for identifying the hydrocarbon generation period of the ancient hydrocarbon source rock is reasonable in design, can quickly and effectively determine the hydrocarbon generation period of the ancient hydrocarbon source rock in the east of China, defines the hydrocarbon generation time of the hydrocarbon source rock, provides important support for hydrocarbon source rock evaluation and oil-gas exploration work in a research area, and has great economic benefit.
Drawings
FIG. 1 is a schematic illustration of a buried history of a formation in the absence of a fault in accordance with the present invention;
FIG. 2 is a schematic illustration of the buried history of a missing formation according to the present invention;
FIG. 3 is a schematic representation of the burial history of an example study of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, taking a yellow-yam down depression wumaying, a northern great port and a western porch area in a bohai gulf basin as an example, a method for identifying a petroliferous season of an ancient hydrocarbon source comprises the following steps:
step 1, determining stratum deletion conditions, counting horizon data of five series of layers of Umberg, northern Hongkong and West porch ancient hydrocarbon source rocks overlying development three-fold line, Jurassic, chalky, ancient line and recent line, and determining that one or more sets of stratum deletions occur in the three-fold line, the Jurassic and chalky line in three areas by using the horizon data of a research area; wherein the WumaYing zone is free of chalk lines; chalk lines were absent in northern hong kong; the western region lacks the dwarfism and chalkbrood;
step 2, counting the thickness of the stratum and the denudation thickness, and respectively counting according to the position data of the selected area: the thickness of the Sanjian, Jurassic, Chalk, ancient and recent systems in the Umami camp area is 700m, 850m, 0m, 600m and 1000m respectively, and the denudation thickness is 600 m; the thickness of Sandsura, Jurassic, Chalk, ancient and recent lines in northern Dagang area is 550m, 600m, 0m, 200m and 450m respectively, and the denudation thickness is 550 m; the thickness of Sanjian, Jurashi, Chalk, ancient and recent series in West region is 500m, 0m, 1050m and 700m respectively, and the denudation thickness is 1800 m;
step 3, drawing a buried history map, carrying out hydrocarbon generation evaluation on the hydrocarbon source rock, drawing the buried history map by taking the thickness of the stratum as a vertical coordinate and the deposition time of the stratum as an abscissa, and judging according to the drawn buried history map to know:
the Ume camp area (H1+ H) is 3100m, H2 > (H1+ H), and ancient hydrocarbon source rock has twice growth;
in northern major harbor (H1+ H) 2900m, but H2 < (H1+ H), ancient biogenic source rock has a primary hydrocarbon generation process, and the hydrocarbon generation time is 180 million years from the present to 130 million years from the present;
the West region (H1+ H) is 1950m, but H2 is more than 2500m, and ancient biogenic rock has a hydrocarbon generation process, and the hydrocarbon generation time is 15 million years from today to now.
The working principle is as follows: when the method for identifying the hydrocarbon generation period of the ancient hydrocarbon source rock is used, the hydrocarbon generation period of the ancient hydrocarbon source rock can be quickly and effectively identified by determining the stratum loss condition of the selected area, counting the thickness of the stratum and the denudation thickness and drawing a buried history map, the hydrocarbon generation time of the ancient hydrocarbon source rock can be quantitatively represented, and powerful support is provided for evaluation of the ancient hydrocarbon source rock and oil-gas exploration work in the eastern region of China.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A method for identifying the hydrocarbon-producing period of an ancient hydrocarbon source rock is characterized by comprising the following steps: the method comprises the following steps:
step 1, determining a stratum deficiency condition, counting the layer data of five series of layers of an ancient biogenic rock overburden development triad system, a Jurassic system, a chalk system, an ancient system and a recent system of a selected area, and determining the stratum deficiency condition by using the layer data of a research area;
step 2, counting the thickness and the denudation thickness of the stratum, and respectively counting the thickness and the denudation thickness of the three-fold line, the Jurassic line, the chalk line, the ancient line and the recent line according to the horizon data of the selected area;
and 3, drawing a buried history map, carrying out hydrocarbon production evaluation on the hydrocarbon source rock, drawing the buried history map by taking the thickness of the stratum as a vertical coordinate and the deposition time of the stratum as a horizontal coordinate, and judging whether the hydrocarbon source rock produces hydrocarbon or not according to the drawn buried history map.
2. The method for identifying the hydrocarbon-producing stage of the ancient hydrocarbon source rock according to claim 1, wherein the method comprises the following steps: in step 1, the stratum loss condition can be divided into: the formation is not lost; deletion of one or more of the three overlapping, Jurassic and Chalkbrood families.
3. The method for identifying the hydrocarbon-producing stage of the ancient hydrocarbon source rock according to claim 1 or 2, wherein: in the step 3, when the stratum is not lost, counting the sum of thicknesses H1 of chalks, dwarases and triassic series and the sum of thicknesses H2 of overlying strata of the hydrocarbon source rock in the horizon data; by taking the thickness of the stratum as an ordinate and the sedimentary time of the stratum as an abscissa, a buried history map is drawn, and the following conditions exist:
if H1 is more than 2000m and H2 is more than 2500m, the hydrocarbon source rock is considered to continuously generate hydrocarbon and is not interrupted;
if H1 is more than 2000m but H2 is less than 2500m, the hydrocarbon source rock is considered to be buried deep in the overburden until the time point of 2000m until 65 million years to the present, and the hydrocarbon generation is stopped until 65 million years to the present;
if H1 < 2000m but H2 > 2500m, the source rock is considered to be buried deep in the overburden to a time point of 2500m only until hydrocarbon continues to be produced today;
if H1 < 2000m and H2 < 2500m, the source rock is considered to be non-hydrocarbon bearing.
4. The method for identifying the hydrocarbon-producing stage of the ancient hydrocarbon source rock according to claim 1 or 2, wherein: in the step 3, when one or more of the three-stacked system, the dwarfism system and the chalk system are missing, counting the sum of thicknesses of the chalk system, the dwarfism system and the three-stacked system H1, the sum of thicknesses of overlying strata of the hydrocarbon source rock H2 and the cumulative denudation thickness H of the missing stratum in the horizon data, and drawing a buried history map by taking the thickness of the stratum as a vertical coordinate and the deposition time of the stratum as a horizontal coordinate, wherein the following conditions exist:
if (H1+ H) < 2000m and H2 < 2500m, the source rock is considered to be non-hydrocarbon-bearing;
if (H1+ H) < 2000m and H2 > 2500m, then the source rock is considered to be buried only as deep as 2500m in the overburden formation until now, the source rock continues to produce hydrocarbons;
if 2500m > (H1+ H) > 2000m and H2 > 2500m, the hydrocarbon source rock is considered to have primary hydrocarbon interruption, and the interruption time is the time point from the denudation of the missing stratum to the burying of the overlying stratum to the depth of (H1+ H);
if 2500m > (H1+ H) > 2000m and H2 < 2500m, it is considered that the hydrocarbon source rock continues to produce hydrocarbons only from the time point when the overburden formation is buried to 2000m to the time point when the missing formation is degraded, and thereafter the hydrocarbon production is stopped;
if (H1+ H) > 2500m and H2 > (H1+ H), the hydrocarbon source rock is considered to have primary hydrocarbon generation interruption, and the interruption time is the time point from the denudation of the missing stratum to the burying of the overlying stratum to the (H1+ H);
if (H1+ H) > 2500m and H2 < (H1+ H), it is considered that the hydrocarbon source rock continues to produce hydrocarbons only from the time point when the overburden formation is buried to 2000m to the time point when the missing formation is degraded, after which the hydrocarbon production is stopped.
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