摘要
四川盆地长兴组礁滩储层，虽然在城口—鄂西海槽西侧发现了大量的野外生物礁剖面和2口生物礁井，但是尚未在生物礁储层勘探上取得重大突破。因此，基于野外地质剖面、钻测井、地震和分析化验等资料，文中对奉节地区长兴组的沉积与储层特征、生物礁的平面展布特征进行了研究。结果表明：1）研究区长兴组总体上形成南北2个台地边缘，中间由1个台内洼地相隔开，南北呈现“两隆三凹”、“隆凹相间”的格局；2）研究区主要发育开阔台地、台内洼地、台缘礁（丘）、斜坡￣海槽相带；3）奉节地区长兴组储层岩石类型主要为生物礁灰（云）岩、藻（藻叠层、藻黏结）云岩、生屑灰（云）岩、砂（砾）屑白云岩，储层物性特征总体上表现为低孔、低渗，局部为低孔、中渗；4）奉节地区主要发育南北两大礁体。
Abstract
Although large-scale of reef profile and two reefs well have been discovered on the west side of the "Chengkou-Exi" trough in Changxing reef reservoir of the Sichuan Basin, but lack of important breakthrough on exploration. Therefore, based on the data of outcrops, drilling and logging well, seismic interpretation and laboratory analysis, the characteristics of sedimentary and reservior and plane distribution characteristics of reefs of the Changxing Formation in the Fengjie area were studied. The results show that: (1) during the Late Permian Changxing Formation period, two platform margins in the north and south and intra-platform depression in the middle part were formed, resulting in a pattern of "two uplifts and three depressions" and "interphase distribution uplift and depressions" from the south to the north. (2) open platform, intra-platform depression, platform-edge reef, slope-trough zone were developed mainly in the study area. (3) the rock types of Changxing Formation in Fengjie area are mainly biohermal limestone (dolomite), algae (algae stack, algae-bonded) dolomite, bioclastic ash (dolomite), and sand (gravel) clastic dolomite. Overall， reservoir physical properties show low pores and low permeability, partly low pores and middle permeability. (4) the two major reefs in the north and the south were developed mainly in Fengjie area.
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