金沙—仁懷及鄰區(qū)海相油氣保存條件分析
發(fā)布時(shí)間：2018-08-22 12:42
【摘要】：本論文所研究的金沙—仁懷及鄰區(qū),由黔中隆起北部和黔北凹陷共同組成。在經(jīng)歷了幾十年對下古生界海相油氣藏的勘探工作后,已取得一些進(jìn)展,區(qū)內(nèi)烴源巖和儲集層條件優(yōu)越,但是由于經(jīng)歷多期次構(gòu)造活動影響,致使區(qū)內(nèi)地質(zhì)結(jié)構(gòu)復(fù)雜、斷裂較為發(fā)育,對油氣成藏保存造成較大影響。因此,加強(qiáng)油氣保存條件的研究對深入開展該區(qū)油氣勘探至關(guān)重要。論文通過野外油氣保存條件調(diào)查,結(jié)合巖石學(xué)、礦物學(xué)、同位素地球化學(xué)等測試分析,系統(tǒng)研究了區(qū)內(nèi)蓋層特征和封蓋性、斷裂演化和封閉性、以及水文地質(zhì)條件,在此基礎(chǔ)上,運(yùn)用模糊數(shù)學(xué)綜合評價(jià)法進(jìn)行了有利油氣保存區(qū)塊優(yōu)選及半定量評價(jià),以期為今后在該區(qū)域開展油氣勘探工作提供參考。取得如下成果:1.通過野外地質(zhì)調(diào)查對區(qū)內(nèi)下寒武黔東統(tǒng)和下志留統(tǒng)龍馬溪組兩套泥質(zhì)巖蓋層巖性進(jìn)行詳細(xì)分類。黔東統(tǒng)蓋層主要巖性為:碳質(zhì)頁巖、硅質(zhì)巖、凝塊巖、粉砂質(zhì)頁巖等。龍馬溪組蓋層主要巖性為:黑色炭質(zhì)泥頁巖、鈣質(zhì)泥巖、泥質(zhì)灰?guī)r、砂質(zhì)(粉砂質(zhì))泥巖。2.對重點(diǎn)蓋層黔東統(tǒng)牛蹄塘組和龍馬溪組進(jìn)行沉積相初步分析,結(jié)果表明牛蹄塘組沉積相為深水陸棚和淺水陸棚相,平面呈北東向展布;龍馬溪組剖面上以深水陸棚—淺水陸棚和混積陸棚相為主,受黔中隆起影響控制,由南向北依次為潮坪相—混積陸棚相—淺水陸棚相。3.對牛蹄塘組和下志留統(tǒng)龍馬溪組泥質(zhì)巖蓋層樣品進(jìn)行X—衍射全巖礦物分析和粘土礦物X—衍射分析,分析結(jié)果表明:兩者均以石英和粘土礦物為主,粘土礦物中以伊利石含量最多,含量均在50%以上。以脆性礦物為主的巖石學(xué)特征造成兩者脆性較大,容易受到構(gòu)造活動的影響,在背斜和斷裂發(fā)育地區(qū)容易形成裂縫,不利于油氣保存。4.重點(diǎn)蓋層物性分析結(jié)果顯示:牛蹄塘組泥質(zhì)巖致密化程度高,封閉能力強(qiáng),具有較好的封蓋能力,屬于Ⅰ類優(yōu)質(zhì)蓋層,對燈影組油氣藏具有重要意義;龍馬溪組泥質(zhì)蓋層屬于封蓋性較好的Ⅱ類蓋層,但由于構(gòu)造因素影響,只能作為局部蓋層。5.結(jié)合牛蹄塘組烴源巖生烴史對丁山1井寒武系膏巖蓋層的有效性展開初步分析。結(jié)果表明,盡管膏巖蓋層具有極佳的物性封閉能力,但是仍未能成藏的關(guān)鍵原因是生烴史與圈閉形成時(shí)間不匹配。因此對于該套蓋層而言今后工作重點(diǎn)應(yīng)放在對生烴史和油氣有效圈閉間耦合關(guān)系的研究。6.對遵義—赫章斷裂帶次級斷裂封閉性展開詳細(xì)分析。較系統(tǒng)采集次級斷裂帶內(nèi)充填物和與之匹配的圍巖樣品,對樣品展開C、O、Sr同位素和流體包裹體分析。同位素分析結(jié)果顯示:充填物與圍巖間的同位素差值較微弱,充填物中的流體來自于晚二疊世或早三疊世地層。流體包裹體以氣相為主,只有少量的液相包裹體;氣相部分以有機(jī)質(zhì)為主,液相部分則主要是水;包裹體均以溫度在166.6℃~302.4℃之間。結(jié)合盆地生烴史表明流體主要來自晚二疊世地層。這說明次級斷裂對下古生界油氣藏而言封閉性良好。7.根據(jù)溫泉溫度估算出現(xiàn)今大氣水下滲深度,結(jié)合斷裂分布特征和相關(guān)泉水成因模式分析表明:大氣水下滲深度與斷裂活動有關(guān);在溫泉影響范圍內(nèi)地層開啟程度高。結(jié)合鉆探實(shí)踐表明區(qū)內(nèi)下古生界海相地層水文地質(zhì)特征總體表現(xiàn)較差,但是局部仍存在較好的水文地質(zhì)條件。8.在系統(tǒng)分析區(qū)內(nèi)蓋層特征和封蓋性、斷裂封閉性和水文地質(zhì)條件等基礎(chǔ)上,初步劃分出兩個(gè)油氣有利保存區(qū)塊:金沙縣重新鎮(zhèn)區(qū)塊和古藺—習(xí)水縣區(qū)塊。運(yùn)用模糊數(shù)學(xué)綜合評價(jià)法對影響區(qū)內(nèi)保存條件的11個(gè)因素進(jìn)行綜合分析評價(jià),評價(jià)結(jié)果表明金沙縣重新鎮(zhèn)區(qū)塊保存條件優(yōu)于古藺—習(xí)水縣區(qū)塊。
[Abstract]:The Jinsha-Renhuai and its adjacent areas studied in this paper are composed of the northern part of the central Guizhou uplift and the northern Guizhou sag. After decades of exploration work for the Lower Paleozoic marine reservoirs, some progress has been made. The source rocks and reservoirs in the area are in good condition, but the geological structure of the area is affected by multi-stage tectonic activities. Therefore, it is very important to strengthen the study of oil and gas preservation conditions for further oil and gas exploration in this area. This paper systematically studies the characteristics and sealing of caprock in this area through field investigation of oil and gas preservation conditions, combined with petrology, mineralogy, isotope geochemistry and other testing and analysis. On this basis, the fuzzy mathematics comprehensive evaluation method is used to optimize and semi-quantitatively evaluate the favorable oil and gas preservation blocks in order to provide reference for future oil and gas exploration in this area. The following results are obtained: 1. Two sets of mudstone caprock lithology of Lower Silurian Longmaxi Formation are classified in detail. The main lithology of the caprock of Eastern Guizhou is carbonaceous shale, siliceous rock, agglomerate, silty shale, etc. The main lithology of the caprock of Longmaxi Formation is black carbonaceous mudstone shale, calcareous mudstone, argillaceous limestone and sandy (silty) mudstone. Preliminary analysis of sedimentary facies in Tang Formation and Longmaxi Formation shows that the Niujitang Formation is a deep-water shelf and shallow-water shelf facies with NE-trending distribution in the plane, and the Longmaxi Formation is dominated by deep-water shelf-shallow-water shelf and mixed shelf facies in the section, which is controlled by the uplift in central Guizhou Province, and in turn is a tidal flat facies-mixed shelf facies-shallow shelf facies from south to north. Water and continental shelf facies.3.X-ray diffraction analysis and clay mineral X-ray diffraction analysis were carried out on the mudstone caprock samples of Niujitang Formation and Lower Silurian Longmaxi Formation. The results show that both of them are mainly quartz and clay minerals. Illite is the most abundant clay mineral, and the content is more than 50%. It is easy to form fractures in anticline and fault developed areas, which is not conducive to oil and gas preservation. 4. The results of physical properties analysis of key caprock show that the Niujitang Formation mudstone has a high degree of densification, strong sealing ability and good sealing ability, and belongs to type I high-quality caprock, which is favorable to Dengying Formation oil. The argillaceous caprock of Longmaxi Formation belongs to type II caprock with good sealing property, but it can only be used as local caprock because of the influence of structural factors. 5. Combining with the hydrocarbon generation history of source rock of Niujitang Formation, the effectiveness of Cambrian gypsum caprock in well Dingshan 1 is preliminarily analyzed. The key reason for the failure of hydrocarbon accumulation is the mismatch between hydrocarbon generation history and trap formation time. Therefore, the future work of this caprock should focus on the study of hydrocarbon generation history and the coupling relationship between oil and gas effective traps. C, O, Sr isotopes and fluid inclusions were analyzed for the fillings in the fracture zone and the matching wall rock samples. Isotope analysis showed that the isotope difference between the fillings and wall rocks was weak, and the fluid in the fillings came from the late Permian or early Triassic strata. Inclusions; gas phase is dominated by organic matter and liquid phase is dominated by water; inclusions are all between 166.6 and 302.4 degrees Celsius. Combined with the hydrocarbon generation history of the basin, the fluid mainly comes from the Late Permian strata. This indicates that the secondary faults are well sealed for the Lower Paleozoic reservoirs. 7. According to the temperature estimation of hot springs, the present atmospheric and underwater seepage appears. Depth, combined with the characteristics of fault distribution and related spring genetic model analysis shows that: the depth of atmospheric underwater seepage is related to fault activity; the formation is highly open within the influence of hot springs. 8. On the basis of systematic analysis of the characteristics and sealing property of the caprock, fault sealing and hydrogeological conditions in the area, two favorable oil and gas preservation blocks are preliminarily divided: the Xinzhen block in Jinsha County and the Gulin-Xishui block in Gulin County. The result shows that the preservation condition of the Reshui town block in Jinsha County is superior to that in Gulin Xishui County.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
[Abstract]:The Jinsha-Renhuai and its adjacent areas studied in this paper are composed of the northern part of the central Guizhou uplift and the northern Guizhou sag. After decades of exploration work for the Lower Paleozoic marine reservoirs, some progress has been made. The source rocks and reservoirs in the area are in good condition, but the geological structure of the area is affected by multi-stage tectonic activities. Therefore, it is very important to strengthen the study of oil and gas preservation conditions for further oil and gas exploration in this area. This paper systematically studies the characteristics and sealing of caprock in this area through field investigation of oil and gas preservation conditions, combined with petrology, mineralogy, isotope geochemistry and other testing and analysis. On this basis, the fuzzy mathematics comprehensive evaluation method is used to optimize and semi-quantitatively evaluate the favorable oil and gas preservation blocks in order to provide reference for future oil and gas exploration in this area. The following results are obtained: 1. Two sets of mudstone caprock lithology of Lower Silurian Longmaxi Formation are classified in detail. The main lithology of the caprock of Eastern Guizhou is carbonaceous shale, siliceous rock, agglomerate, silty shale, etc. The main lithology of the caprock of Longmaxi Formation is black carbonaceous mudstone shale, calcareous mudstone, argillaceous limestone and sandy (silty) mudstone. Preliminary analysis of sedimentary facies in Tang Formation and Longmaxi Formation shows that the Niujitang Formation is a deep-water shelf and shallow-water shelf facies with NE-trending distribution in the plane, and the Longmaxi Formation is dominated by deep-water shelf-shallow-water shelf and mixed shelf facies in the section, which is controlled by the uplift in central Guizhou Province, and in turn is a tidal flat facies-mixed shelf facies-shallow shelf facies from south to north. Water and continental shelf facies.3.X-ray diffraction analysis and clay mineral X-ray diffraction analysis were carried out on the mudstone caprock samples of Niujitang Formation and Lower Silurian Longmaxi Formation. The results show that both of them are mainly quartz and clay minerals. Illite is the most abundant clay mineral, and the content is more than 50%. It is easy to form fractures in anticline and fault developed areas, which is not conducive to oil and gas preservation. 4. The results of physical properties analysis of key caprock show that the Niujitang Formation mudstone has a high degree of densification, strong sealing ability and good sealing ability, and belongs to type I high-quality caprock, which is favorable to Dengying Formation oil. The argillaceous caprock of Longmaxi Formation belongs to type II caprock with good sealing property, but it can only be used as local caprock because of the influence of structural factors. 5. Combining with the hydrocarbon generation history of source rock of Niujitang Formation, the effectiveness of Cambrian gypsum caprock in well Dingshan 1 is preliminarily analyzed. The key reason for the failure of hydrocarbon accumulation is the mismatch between hydrocarbon generation history and trap formation time. Therefore, the future work of this caprock should focus on the study of hydrocarbon generation history and the coupling relationship between oil and gas effective traps. C, O, Sr isotopes and fluid inclusions were analyzed for the fillings in the fracture zone and the matching wall rock samples. Isotope analysis showed that the isotope difference between the fillings and wall rocks was weak, and the fluid in the fillings came from the late Permian or early Triassic strata. Inclusions; gas phase is dominated by organic matter and liquid phase is dominated by water; inclusions are all between 166.6 and 302.4 degrees Celsius. Combined with the hydrocarbon generation history of the basin, the fluid mainly comes from the Late Permian strata. This indicates that the secondary faults are well sealed for the Lower Paleozoic reservoirs. 7. According to the temperature estimation of hot springs, the present atmospheric and underwater seepage appears. Depth, combined with the characteristics of fault distribution and related spring genetic model analysis shows that: the depth of atmospheric underwater seepage is related to fault activity; the formation is highly open within the influence of hot springs. 8. On the basis of systematic analysis of the characteristics and sealing property of the caprock, fault sealing and hydrogeological conditions in the area, two favorable oil and gas preservation blocks are preliminarily divided: the Xinzhen block in Jinsha County and the Gulin-Xishui block in Gulin County. The result shows that the preservation condition of the Reshui town block in Jinsha County is superior to that in Gulin Xishui County.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
【參考文獻(xiàn)】
相關(guān)期刊論文 前3條
1 胡曉鳳;王韶華;盛賢才;肖傳桃;;中揚(yáng)子區(qū)海相地層水化學(xué)特征與油氣保存[J];石油天然氣學(xué)報(bào);2007年02期
2 周雁;金之鈞;朱東亞;袁玉松;李雙建;;油氣蓋層研究現(xiàn)狀與認(rèn)識進(jìn)展[J];石油實(shí)驗(yàn)地質(zhì);2012年03期
3 張長江;潘文蕾;劉光祥;管宏林;;中國南方志留系泥質(zhì)巖蓋層動態(tài)評價(jià)研究[J];天然氣地球科學(xué);2008年03期
相關(guān)博士學(xué)位論文 前2條
1 翟常博;川東南綦江—仁懷地區(qū)頁巖氣成，
本文編號：2197132
本文鏈接：http://sikaile.net/kejilunwen/diqiudizhi/2197132.html
最近更新
教材專著
