本文關(guān)鍵詞：元壩氣田長興組生物礁層序沉積及其對儲層發(fā)育的控制，由筆耕文化傳播整理發(fā)布。

元壩氣田長興組生物礁層序沉積及其對儲層發(fā)育的控制

Sequence and sedimentary characteristics of Changxing Formation organic reefs in the Yuanba Gasfield and their controlling effects on reservoir development in the Sichuan Ba

[1] [2] [3] [4] [5]

Li Hongtao , Long Shengxiang , You Yuchun , Liu Guoping , Li Xiupeng （1.Sinopec Exploration and Production Research Institute, Beijing 100083, China ; 2.Sinopec Key Laborato-

[1]中國石化石油勘探開發(fā)研究院; [2]中國石化海相油氣藏開發(fā)重點實驗室

文章摘要：四川盆地元壩氣田上二疊統(tǒng)長興組氣藏目前已全面轉(zhuǎn)向開發(fā)，隨著開發(fā)工作的有序推進，迫切需要精細描述儲層結(jié)構(gòu)，總結(jié)儲層發(fā)育的控制因素。為此，基于巖心觀察、薄片鑒定結(jié)果，結(jié)合物性數(shù)據(jù)、測井曲線等分析成果，重點研究了該區(qū)長興組生物礁的層序地層、沉積相、儲層特征以及儲層結(jié)構(gòu)。結(jié)果表明：①該區(qū)長興組可劃分為2個三級層序和6個四級層序，高頻層序界面上、下電測曲線突變響應(yīng)特征明顯，，電測曲線組合變化特征與高頻層序所控制的沉積旋回具有較好的一致性；②長興組生物礁主要發(fā)育在上部三級層序（SQ2）中的臺地邊緣外倒并呈條帶狀分布，縱向上由2個明顯的成礁旋回構(gòu)成，在橫向上具有“東早西晚”不對稱規(guī)模發(fā)育的分布特征；③生物礁（灘）型儲層總體以低孔隙度、中低滲透率溶孔自云巖儲層為主，主要發(fā)育于2個四級層序中部一上部生物礁礁蓋部位，具有“層數(shù)多、單層薄、不同類型儲層呈不等厚互層、非均質(zhì)性強”和“雙層儲層結(jié)構(gòu)”的特征。結(jié)論認(rèn)為，高頻層序控制了該區(qū)生物礁沉積微相的分布，是影響儲層發(fā)育與空間展布的關(guān)鍵因素。

Abstr：In the Yuanba area, Sichuan Basin, the gas reservoirs in the Upper Permian Changxing Formation are now at development stage. With the smooth progress of development, it is urgent to characterize the reservoir architectures accurately and summarize the controlling factors of reservoir development. In this paper, research was mainly performed on the Changxing Formation organic reefs in terms of their sequence stratigraphy, sedimentary facies, and reservoir characteristics and architectures based on core observation and thin section analysis, combined with physical property data and logging curves analysis results. It is shown that the Changing Formation can be divided into two third-order sequences and six fourth-order sequences, whose electric logs are characterized by sud den change above and below the high-frequency sequence boundary and by better accordance with the sedimentary cycles controlled by high-frequency sequences. Besides, the Changxing Formation organic reefs are mainly distributed in the form of ribbons outside SQ2 platform margin, and they are vertically composed of two obvious two reef sedimentary cycles and laterally developed in asym- metric patterns （early in the east and late in the west）. Finally, in general, organic reef （bank） reservoirs are mainly composed of low-porosity and middle-low-permeability dissolved dolomite reservoirs, and they are mostly distributed at reef caps in the upper- middle parts of the two fourth-order sequences, with the characteristics of multiple beds, thin single beds, interbedded strata of dif- ferent types of reservoirs with different thickness, strong heterogeneity and double-layer reservoir architectures. It is concluded that the distribution of organic reef microfacie

文章關(guān)鍵詞：

Keyword：:Sichuan Basin Yuanba Gasfield Late Permian Changxing Fm Organic reef Sequence stratigraphy Sedimentary faci-es Reservoir characteristics Reservoir architecture

課題項目：國家科技重大專項“海相碳酸鹽巖層系優(yōu)質(zhì)儲層分布與保存條件評價”（編號：2011ZX05005002）、中國石化科技部項目“元壩長興組氣藏地質(zhì)特征及開發(fā)政策研究”（編號：P11005）和“海相油氣藏開發(fā)關(guān)鍵技術(shù)”（編號：G5800-15-ZS-YK032）.

作者信息：會員可見

  本文關(guān)鍵詞：元壩氣田長興組生物礁層序沉積及其對儲層發(fā)育的控制，由筆耕文化傳播整理發(fā)布。