【摘要】：近年來,我國在海相碳酸鹽巖勘探開發(fā)中取得了重大突破,在四川盆地等地發(fā)現(xiàn)了重要的碳酸鹽巖油氣田。2011年高石1井鉆探成功,在燈影組獲得重大發(fā)現(xiàn),2012年磨溪8井龍王廟組試油獲氣產(chǎn)量190.68×104m3/d,揭開了龍王廟組勘探開發(fā)的序幕。盡管前人對高石梯-磨溪地區(qū)龍王廟組做了大量研究,但由于碳酸鹽巖油氣藏埋深大、儲層非均質(zhì)性強、油氣成藏控制因素復(fù)雜,導(dǎo)致很多問題認識不很透徹,因此,開展龍王廟組儲層特征和主控因素的研究,對于該區(qū)有利儲層的分布預(yù)測具有重要的指導(dǎo)意義。本文以儲層沉積學(xué)等學(xué)科為理論指導(dǎo),在巖心觀察、薄片鑒定的基礎(chǔ)上,結(jié)合大量物性測試資料,對研究區(qū)龍王廟組灘相儲層發(fā)育特征及主控因素進行了較為深入的研究,主要取得了以下幾點認識:1、對研究區(qū)儲層發(fā)育特征進行研究,劃分了儲層成因類型,認為龍王廟組儲集巖以顆粒云巖和晶粒云巖為主,儲集空間以粒間溶孔、晶間(溶)孔和順層溶洞為主,總體為低孔低滲型儲層,局部為低孔高滲型儲層。龍王廟組儲層分為五種成因類型,分別為:(1)密集順層溶洞型晶粒云巖儲層(Ⅰ-1類);(2)溶洞型顆粒云巖儲層(Ⅰ-2類);(3)針孔和孤立小洞型顆粒云巖儲層(Ⅱ-1類);(4)針孔型顆粒云巖儲層(Ⅱ-2類);(5)溶孔和零星小洞型“花斑狀”晶粒云巖儲層(Ⅲ類)。Ⅰ-1類儲層物性最好,Ⅲ類儲層物性最差。2、從巖性巖相、高頻層序、成巖作用及構(gòu)造破裂作用四方面分析儲層的主控因素。研究表明工區(qū)粉-細晶云巖和砂屑云巖儲層物性最好。工區(qū)龍王廟組為一個三級層序,進一步分為兩個四級層序pss1和pss2,儲層以四級層序旋回頂部最好;磨溪地區(qū)儲層較高石梯地區(qū)好,多集中在pss1高位域頂部和pss2高位域,高石梯地區(qū)儲層多集中在pss2中上部。溶蝕作用形成溶孔和溶洞,對儲層孔隙形成起建設(shè)性作用,壓實壓溶作用和膠結(jié)作用對儲層具有破壞性,白云巖化作用和泥晶作用利于孔隙的保存。構(gòu)造破裂作用形成的裂縫提高了儲層的滲透率。3、研究表明,龍王廟組儲層經(jīng)歷的成巖序列為:顆粒灘沉積→海水膠結(jié)→準同生期溶蝕→準同生期白云巖化→表生期溶蝕→熱液礦物充填→埋藏溶蝕→構(gòu)造破裂,據(jù)此將其劃分為孔隙形成、表生溶蝕改造、熱液礦物充填、埋藏溶蝕-瀝青充填和構(gòu)造破裂五個階段,從而建立了龍王廟組儲層演化模式,孔隙形成和表生溶蝕改造階段使儲層孔隙度增加,熱液礦物充填和埋藏溶蝕-瀝青充填階段使孔隙度降低,構(gòu)造破裂階段產(chǎn)生的裂縫改善了儲層的滲透率。4、在龍王廟組灘相儲層縱向序列和橫向?qū)Ρ确治龅幕A(chǔ)上,以儲層發(fā)育模式為指導(dǎo),預(yù)測龍王廟組有利儲層的平面分布。高石梯地區(qū)pss1儲層一般,pss2儲層變好,以pss2頂部的灘核微相和云坪亞相儲層物性最好;磨溪地區(qū)儲層優(yōu)于高石梯地區(qū);Ⅰ類儲層主要分布在磨溪地區(qū)臺內(nèi)灘及西北部剝蝕區(qū)邊緣,向東部、南部過渡為Ⅱ-Ⅲ類儲層,pss2儲層較pss1儲層變好、連通性變好、分布面積增大。
[Abstract]:In recent years, China has made a major breakthrough in the exploration and development of marine carbonatite, and found an important carbonate oil and gas field in the Sichuan Basin. In 2011, the drilling of the high-rock 1 well has been successful, and it has been found in the lamp-shadow group. In 2012, the test oil of Longwangmiao Formation of the 8-well in the Jingxi-8 well was produced at a gas yield of 190. 68-104m3/ d. The prologue of the exploration and development of the Longwangmiao Formation was opened. Although a large number of studies have been done on the Longwangmiao Formation in the high-stone-ground-ground-xi area, because of the large buried depth of the carbonate reservoirs, the non-homogeneity of the reservoir and the complicated control factors of the oil and gas reservoirs, the understanding of many problems is not thorough, and therefore, The study of reservoir characteristics and main control factors in Longwangmiao Formation is of great significance to the distribution prediction of favorable reservoirs in this area. On the basis of core observation and sheet identification, the characteristics of reservoir development and main control factors of Longwangmiao Formation of Longwangmiao Formation in the research area are studied in this paper based on the theory of reservoir sedimentology and other disciplines. The characteristics of reservoir development in the study area are studied, the genetic types of the reservoir are divided, and the granites of the Longwangmiao Formation are dominated by the granulites and the grain-cloud rocks, and the reservoir space is dominated by the intergranular dissolved pores, the inter-crystal (soluble) pores and the cis-layer karst cave, and the total is the low-porosity low-permeability reservoir. and the local is a low-hole high-permeability reservoir. The reservoir of Longwangmiao Formation is divided into five types of formation, namely: (1) dense and smooth-layer cave-type grain-cloud reservoir (type I-1); (2) karst-type particle cloud-rock reservoir (type I-2); (3) pinhole and isolated small-hole type particle cloud-rock reservoir (type II-1); (4) Pinhole-type particle cloud-rock reservoir (type II-2); (5) pore-soluble and small-hole-type and small-hole-type grain-like grain-cloud-rock reservoir (class III). The properties of class I-1 have the best physical properties, and the physical properties of Class 鈪，

本文編號：2359182