渤中8-A构造火山岩岩相识别及有利储层预测

Lithofacies identification and favorable reservoir prediction of volcanic rocks in BZ8-A structure

张藜 徐长贵 王国强 刘艺萌 郭瑞

ZHANG Li XU Changgui WANG Guoqiang LIU Yimeng GUO Rui

中海石油(中国)有限公司天津分公司

Tianjin Branch of China National Offshore Oil Co., Ltd., Tianjin 300459

火山岩优质储层发育受岩性岩相控制。为探明渤中8-A构造火山岩优质储层分布，利用火山岩内部反射特征、几何形态等地震相特征，依据渤海其他已钻中心式火山岩岩相分布模式、火山喷发机制，结合地震属性，时间、相干切片等，识别出16个沿断裂发育带呈线状分布的环状、近环状火山口，并围绕火山口附近识别出柱状、近蘑菇状火山通道相，弱振幅、断续、透镜状近火山口相（包括爆发相和溢流相）和强振幅连续远火山口相。其中，近火山口相是优质储层发育的最有利相带。渤中8-A构造主体为中酸性的爆发相和溢流相，且断裂发育，构造主体不整合面和多期火山活动的短暂风化面附近是有利储层分布区，具有良好的勘探潜力。

The development of high-quality volcanic reservoirs is dominated by lithofacies.In order to figure out the distribution of favorable reservoirs in BZ8-A structure, we identified 16 ring and nearly-ring volcanic craters which are distributed linearly along fault development zones according to the lithofacies distribution mode and volcanic eruption mechanism of other central volcanic rocks that had been drilled in the Bohai Sea, based on the inner reflection characteristic and geometric shape of volcanic rocks, combined with seismic attributes, time and coherence slice.And around the volcanic craters, columnar and mushroom shaped volcanic channel facies, weak-amplitude, discontinuous and lenticular near crater facies (including eruption facies and overflow facies) and strong-amplitude and continuous far crater facies are identified.Among them, near crater facies is the most favorable facies for the development of high-quality reservoirs.In the main part of BZ8-A structure, it is the neutral-acidic eruption facies and overflow facies, and faults are developed.And favorable reservoirs are distributed near the unconformity of the main part and the short-period erosion surface, and their hydrocarbon potential is promising.

10.13639/j.odpt.2018.S0.007