遼東灣坳陷油氣成藏動態(tài)耦合過程研究
發(fā)布時間：2019-03-28 18:22
【摘要】：遼東灣坳陷是渤海灣盆地重要產(chǎn)油區(qū),勘探開發(fā)程度已較高,需要尋找潛在的勘探新區(qū)域,因此加強油氣成藏研究是必要的,成藏過程是一個復(fù)雜的動態(tài)過程,涉及多個成藏要素的時空配置關(guān)系,目前對遼東灣坳陷成藏要素的空間配置關(guān)系已有較深入的認識,但對動態(tài)耦合過程的研究還不夠系統(tǒng)。本文通過對典型油氣藏成藏特征研究,認識到遼東灣坳陷油氣成藏主控因素是烴源、斷裂、圈閉、溫壓系統(tǒng)等,在此基礎(chǔ)上利用生烴動力學(xué)、盆地模擬、油氣地球化學(xué)、沉積構(gòu)造分析等方法,研究遼東灣坳陷烴源巖熱演化過程、生排烴過程、圈閉演化過程、斷裂系統(tǒng)演化過程、油氣充注等過程的耦合關(guān)系,恢復(fù)遼東灣坳陷的成藏動態(tài)過程,論文取得的成果如下。(1)遼東灣坳陷油氣成藏的主控因素表現(xiàn)在,烴源巖演化決定了烴類流體性質(zhì)的差異;優(yōu)質(zhì)烴源巖分布控制了油氣富集區(qū)的展布;斷裂系統(tǒng)控制了儲層分布與質(zhì)量、油氣的運移與保存;異常高壓既為烴源巖提供排烴動力又為下伏油氣提供遮擋;有效圈閉形成時間定了油氣聚集的成敗。(2)利用Easy%Ro動力學(xué)模型進行的單井、二維、三維模擬結(jié)果表明,在東營組三段沉積末(距今30.3Ma)沙河街組三、四段烴源巖進入生烴門限,沙河街組一段、東營組三段烴源巖均未進入生烴門限。東營組一段沉積末期(距今23.3Ma)沙河街組三、四段烴源巖達到生油氣高峰階段,沙河街組一段和東營組三段下烴源巖進入生烴門限�，F(xiàn)今,主力烴源巖均處于大量生烴階段。北段比中段南段成熟度高,南段烴源巖進入生烴門限時間最晚。(3)借鑒構(gòu)造演化階段,結(jié)合遼東灣各期構(gòu)造應(yīng)力場及斷裂剖面演化圖,根據(jù)大量地震解釋剖面上斷層斷點斷距和上下盤厚度差恢復(fù)了遼東灣坳陷斷裂系統(tǒng)在各沉積時期的活動性,距今65-38Ma主干斷裂多為初始發(fā)育期,活動速率小于30m/Ma。距今38-32.8Ma,活動速率開始增大,活動速率集中在30-60m/Ma。距今約32.8-24.6Ma北段遼西3號、遼中1號、遼東2號均有一定的活動性,活動速率集中在30-90m/Ma之間。距今24.6-12.0Ma各斷層多處于靜止狀態(tài)。僅北段遼中2號北段有一定活動性,活動速率為6.23m/Ma。(4)遼中坳陷北段深層超壓幅度最大,壓力系數(shù)可達1.60~1.80。遼中凹陷及遼西凸起異常高壓主要分布在東營組二段下至沙河街組一段和沙河街組三段。通對JZ25-1沙河街組油氣包裹體捕獲壓力系數(shù)的計算值集中在1.20~1.40之間,推斷在遼東灣坳陷北段油氣大規(guī)模充注時期,地層已普遍發(fā)育超壓。(5)恢復(fù)了遼東灣坳陷北段遼西凸起區(qū)、遼中凹陷區(qū)、遼東凸起區(qū),中段遼西凸起區(qū)和遼中凹陷區(qū)以及南段的遼中凹陷區(qū)成藏耦合動態(tài)過程,通過對比已發(fā)現(xiàn)的大型油氣田成藏耦合過程,預(yù)測遼東凸起北段JZ23構(gòu)造帶為有利勘探區(qū)域,JZ23構(gòu)造具有良好的成藏條件且成藏主控因素之間具有較好的動態(tài)耦合關(guān)系,勘探潛力較大。
[Abstract]:Liaodong Bay depression is an important oil-producing area in Bohai Bay Basin, and the exploration and development degree is high. Therefore, it is necessary to strengthen the study of oil and gas accumulation, and the reservoir-forming process is a complex dynamic process. There is a deep understanding of the spatial distribution of reservoir-forming elements in Liaodong Bay depression at present, but the research on dynamic coupling process is not systematic enough. Based on the study of typical reservoir-forming characteristics, the main controlling factors of hydrocarbon accumulation in Liaodong Bay depression are hydrocarbon source, fault, trap, temperature-pressure system and so on. On this basis, hydrocarbon generation dynamics, basin simulation, oil and gas geochemistry, etc., are used to make use of hydrocarbon generation dynamics, basin simulation and oil and gas geochemistry. The thermal evolution process, hydrocarbon generation and expulsion process, trap evolution process, fault system evolution process and hydrocarbon filling process of the Liaodong Bay depression are studied by means of sedimentary structure analysis and other methods, and the reservoir formation dynamic process of the Liaodong Bay depression is restored. The results obtained in this paper are as follows. (1) the main controlling factors of hydrocarbon accumulation in Liaodong Bay depression are that the evolution of source rocks determines the difference of hydrocarbon fluid properties; The distribution of high quality source rocks controls the distribution of oil and gas enrichment areas, fault systems control reservoir distribution and quality, migration and preservation of oil and gas, abnormally high pressure not only provides hydrocarbon expulsion power for source rocks, but also provides shelter for underlying oil and gas. The formation time of effective traps determines the success or failure of oil and gas accumulation. (2) the results of single well, two-dimensional and three-dimensional simulation by using Easy%Ro dynamic model show that at the end of the third member of the Dongying formation (up to now 30.3Ma) Shahejie formation three, The source rocks of the fourth member enter the threshold of hydrocarbon generation, the first member of Shahejie formation and the third member of Dongying formation do not enter the threshold of hydrocarbon generation. The source rocks of the third and fourth member of the Shahejie formation in the first member of the Dongying formation (23.3Ma) reach the peak stage of oil and gas generation, and the lower source rocks of the first member of the Shahejie formation and the third member of the Dongying formation enter the hydrocarbon generation threshold. Nowadays, the main source rocks are in a large amount of hydrocarbon generation stage. The maturity of the northern part is higher than that of the middle section, and the hydrocarbon source rock in the south reaches the threshold time of hydrocarbon generation. (3) referring to the stage of tectonic evolution, combined with the evolution map of tectonic stress field and fault profile in each stage of Liaodong Bay, Based on a large number of seismic interpretation profiles, the activity of fault system in Liaodong Bay depression during each sedimentary period has been restored by the fault distance and the difference in the thickness of the upper and lower plates. The main faults of 65-38Ma are mostly in the initial stage of development and the rate of activity is less than 30mgma. From 38 to 32.8 Ma, the activity rate began to increase, and the activity rate was concentrated at 30 ~ 60 m 路Ma ~ (- 1). Up to now, there is a certain activity in west Liaoning 3, Liaozhong 1 and Liaodong 2 in the northern part of 32.8-24.6Ma, and the rate of activity is concentrated between 30-90m/Ma. Up to now, most of the faults in 24.6-12.0Ma are in static state. Only the northern part of Liaozhong No.2 is active, and the rate of activity is 6.23m / Ma. (4) the maximum amplitude of deep overpressure is found in the northern part of Liaozhong depression, and the pressure coefficient can reach 1.60x1.80. The abnormal high pressure in Liaozhong sag and western Liaoning uplift is mainly distributed in the first member from the second member of Dongying formation to the first member of Shahejie formation and the third member of Shahejie formation. The calculated values of oil-gas inclusion capture pressure coefficient of JZ25-1 Shahejie formation are between 1.20 and 1.40, and the large-scale filling period of oil and gas in the northern part of Liaodong Bay depression is inferred. Overpressure has generally developed in the strata. (5) the dynamic process of reservoir-forming coupling has been restored in the northern part of Liaodong Bay depression, the western Liaoning uplift area, the central Liaoning depression area, the eastern Liaoning uplift area, the central Liaoning uplift area and the central Liaoning depression area, and in the southern part of the Liaodong Bay depression, the reservoir-forming and coupling processes have been restored in the northern part of the Liaodong Bay depression. By comparing the reservoir-forming coupling process discovered in the large-scale oil and gas fields, it is predicted that the JZ23 structural belt in the northern segment of the Liaodong uplift is a favorable exploration area, and that the JZ23 structure has good reservoir-forming conditions and a good dynamic coupling relationship between the main controlling factors of the reservoir-forming. There is a great potential for exploration.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P618.13
本文編號：2449116
[Abstract]:Liaodong Bay depression is an important oil-producing area in Bohai Bay Basin, and the exploration and development degree is high. Therefore, it is necessary to strengthen the study of oil and gas accumulation, and the reservoir-forming process is a complex dynamic process. There is a deep understanding of the spatial distribution of reservoir-forming elements in Liaodong Bay depression at present, but the research on dynamic coupling process is not systematic enough. Based on the study of typical reservoir-forming characteristics, the main controlling factors of hydrocarbon accumulation in Liaodong Bay depression are hydrocarbon source, fault, trap, temperature-pressure system and so on. On this basis, hydrocarbon generation dynamics, basin simulation, oil and gas geochemistry, etc., are used to make use of hydrocarbon generation dynamics, basin simulation and oil and gas geochemistry. The thermal evolution process, hydrocarbon generation and expulsion process, trap evolution process, fault system evolution process and hydrocarbon filling process of the Liaodong Bay depression are studied by means of sedimentary structure analysis and other methods, and the reservoir formation dynamic process of the Liaodong Bay depression is restored. The results obtained in this paper are as follows. (1) the main controlling factors of hydrocarbon accumulation in Liaodong Bay depression are that the evolution of source rocks determines the difference of hydrocarbon fluid properties; The distribution of high quality source rocks controls the distribution of oil and gas enrichment areas, fault systems control reservoir distribution and quality, migration and preservation of oil and gas, abnormally high pressure not only provides hydrocarbon expulsion power for source rocks, but also provides shelter for underlying oil and gas. The formation time of effective traps determines the success or failure of oil and gas accumulation. (2) the results of single well, two-dimensional and three-dimensional simulation by using Easy%Ro dynamic model show that at the end of the third member of the Dongying formation (up to now 30.3Ma) Shahejie formation three, The source rocks of the fourth member enter the threshold of hydrocarbon generation, the first member of Shahejie formation and the third member of Dongying formation do not enter the threshold of hydrocarbon generation. The source rocks of the third and fourth member of the Shahejie formation in the first member of the Dongying formation (23.3Ma) reach the peak stage of oil and gas generation, and the lower source rocks of the first member of the Shahejie formation and the third member of the Dongying formation enter the hydrocarbon generation threshold. Nowadays, the main source rocks are in a large amount of hydrocarbon generation stage. The maturity of the northern part is higher than that of the middle section, and the hydrocarbon source rock in the south reaches the threshold time of hydrocarbon generation. (3) referring to the stage of tectonic evolution, combined with the evolution map of tectonic stress field and fault profile in each stage of Liaodong Bay, Based on a large number of seismic interpretation profiles, the activity of fault system in Liaodong Bay depression during each sedimentary period has been restored by the fault distance and the difference in the thickness of the upper and lower plates. The main faults of 65-38Ma are mostly in the initial stage of development and the rate of activity is less than 30mgma. From 38 to 32.8 Ma, the activity rate began to increase, and the activity rate was concentrated at 30 ~ 60 m 路Ma ~ (- 1). Up to now, there is a certain activity in west Liaoning 3, Liaozhong 1 and Liaodong 2 in the northern part of 32.8-24.6Ma, and the rate of activity is concentrated between 30-90m/Ma. Up to now, most of the faults in 24.6-12.0Ma are in static state. Only the northern part of Liaozhong No.2 is active, and the rate of activity is 6.23m / Ma. (4) the maximum amplitude of deep overpressure is found in the northern part of Liaozhong depression, and the pressure coefficient can reach 1.60x1.80. The abnormal high pressure in Liaozhong sag and western Liaoning uplift is mainly distributed in the first member from the second member of Dongying formation to the first member of Shahejie formation and the third member of Shahejie formation. The calculated values of oil-gas inclusion capture pressure coefficient of JZ25-1 Shahejie formation are between 1.20 and 1.40, and the large-scale filling period of oil and gas in the northern part of Liaodong Bay depression is inferred. Overpressure has generally developed in the strata. (5) the dynamic process of reservoir-forming coupling has been restored in the northern part of Liaodong Bay depression, the western Liaoning uplift area, the central Liaoning depression area, the eastern Liaoning uplift area, the central Liaoning uplift area and the central Liaoning depression area, and in the southern part of the Liaodong Bay depression, the reservoir-forming and coupling processes have been restored in the northern part of the Liaodong Bay depression. By comparing the reservoir-forming coupling process discovered in the large-scale oil and gas fields, it is predicted that the JZ23 structural belt in the northern segment of the Liaodong uplift is a favorable exploration area, and that the JZ23 structure has good reservoir-forming conditions and a good dynamic coupling relationship between the main controlling factors of the reservoir-forming. There is a great potential for exploration.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P618.13
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