塔里木板块塔中83井-16井区上奥陶统礁滩复合体储层结构

塔里木板块塔中Ⅰ号坡折带的塔中83井—塔中16井区上奥陶统良里塔格组碳酸盐岩地层钻遇厚度170～300 m,这套镶边台地型沉积相一般展示为4～5个礁滩复合体叠加旋回,岩相以及之后的岩溶、构造作用是控制圈闭单元形成的决定因素.根据岩芯、薄片及测井的各类指标分析,储集空间类型可划分为溶洞、孔洞、粒内溶孔、铸模孔、粒间溶孔、...

Reservior Structures of the Upper Ordovician Reef Complexes in Tazhong 83-16 Well Area, Tarim Block

Carbonate sequences of the upper Ordovician Lianglitag Formation along the Tazhong 83-Tazhong 16 well blocks，
Slope Break I，Tarim Block is 170-300 m thick and notable as reservoirs of oil-gas．This suite of sedimentary facies from the
platform margin is generally shown as overlapping of reef complexes with 4-5 cycles. Lithological facies as well as enhanced karst and tectonic action onward are considerable factors controlling the trap formation．Based on the analysis of drilling cores, thin sections and logging parameters, types of reservoir space are recognized as cave，intragranularly dissolved pores，intercrystalline dissolved pores，moldic pore，biologic dorsal pore，organic framework pore and micro-fracture．The features of the void structures as well as their associations are catalogued as vug，fracture-vug, and fracture configuration types, respectively，and are in similar abundance. Nevertheless， the perspective of reservoirs with good conditions of porosity and permeability are favorable for spatial distribution from the platform margin of the Slope-break I. Such a model is subtly consistent with reef-bank complexes. Outer setting of the platform margin has ideal lithologiolal facies that experienced multiple reformation phases and show weak filling.The reservoir pattern shows that fracture-vug and vug types are dominant. Therefore, we consider it a potential area for highquality type I andⅡ reservoirs. However, inner setting of the platform margin along the Tazhong 12-Tazhong 16 well blocks is dominated by fractures and high lithological filling during later periods that resulted in type Ⅱ and Ⅲreservoir.