阆中南部地区大安寨段储层特征及控制因素

利用沉积岩石学、储层地质学、测井地质学等理论及技术方法，依据钻井、录井、岩芯、测井和室内测试分析 等资料，对研究区侏罗系自流井组大安寨段储层特征及控制因素开展了研究。研究表明，大安寨段储集层岩性为残余 介壳灰岩、粉粗晶介壳灰岩、亮晶介壳屑灰岩和泥质介壳灰岩；岩石以介壳为主，矿物以方解石为主，沉积环境主 要为介屑滩微相；主要储渗空间为溶蚀孔洞、晶间孔和裂缝，孔隙以微孔隙为主，喉道以微喉道为主；储层孔隙总体较 差，主要为微孔微喉型和微孔细喉型；储层为孔隙、裂缝双重介质型的特低孔低渗致密储层。储集体分布受沉积微相 控制，介屑滩相是储层发育的最有利相带；优质储层的发育受沉积古地貌高地控制；溶蚀作用、构造破裂作用等对溶蚀 孔洞和裂缝的发育起建设性作用，压实压溶作用、方解石胶结作用对储层物性起破坏性作用。

An Analysis of Reservoir Characteristics and Controlling Factors#br# of Jurassic Da′anzhai Section in Langzhong Nanbu Area

We carried out researches on reservoir characteristics and controlling factors of reservoir development of Jurassic artesian group Da′anzhai section according to theories and technical methods of sedimentary rock，reservoir geology，logging geology，and by using data of drilling，logging，cores，well logs and indoor test analysis，etc. The results showed thatrock structure components in the reservoir of Da′anzhai section are shell-based residual shell limestone，rose quartz -coarse-grained shell limestone，bright crystal medium debris and muddy shell limestone；with calcite as the main mineral ingredients；the sedimentary environment is mainly debris beach microfacies；the main reservoir space for dissolution infiltration holes，intergranular holes and cracks with micro pores and micro throat；pore structure is mainly micro pore with micro throat and fine throat； reservoir porosity concentrated between 0.5% to 2.0% and permeability are more concentrated between 0.001 to 1.000 mD. The analysisled to the conclusion that sedimentary microfacies control the reservoir distribution；debris beach reservoir is the most favorable facies；sedimentary palaeogeomorphology highland controlled the quality reservoir development；dissolution and tectonic disruption played a constructive role in dissolution holes and cracks；compaction pressure solution and calcite cementation had devastating effects on reservoir properties.